2
2*cos(x) 2*x*cos (x)
x - -------- + -----------
sin(x) 2
sin (x)
--------------------------
sin(x)
$$\frac{x + \frac{2 x \cos^{2}{\left(x \right)}}{\sin^{2}{\left(x \right)}} - \frac{2 \cos{\left(x \right)}}{\sin{\left(x \right)}}}{\sin{\left(x \right)}}$$
/ /x\ /x pi\ 2/x pi\ 2/x\ \
| sec|-| sec|- - --| x*sec |- - --| x*sec |-| |
| \2/ \2 2 / \2 2 / \2/ | /x\ /x pi\
|----------- - ----------- + -------------- + --------------|*sec|-|*sec|- - --|
| /x pi\ /x\ 2/x\ 2/x pi\| \2/ \2 2 /
|sec|- - --| sec|-| 2*sec |-| 2*sec |- - --||
\ \2 2 / \2/ \2/ \2 2 //
--------------------------------------------------------------------------------
2
$$\frac{\left(\frac{x \sec^{2}{\left(\frac{x}{2} \right)}}{2 \sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + \frac{x \sec^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{2 \sec^{2}{\left(\frac{x}{2} \right)}} + \frac{\sec{\left(\frac{x}{2} \right)}}{\sec{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} - \frac{\sec{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\sec{\left(\frac{x}{2} \right)}}\right) \sec{\left(\frac{x}{2} \right)} \sec{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{2}$$
/ 2\
| 2/x\ / 2/x\\ |
| -1 + cot |-| x*|-1 + cot |-|| |
/ 2/x\\ | \2/ \ \2// |
|1 + cot |-||*|x - ------------ + -----------------|
\ \2// | /x\ 2/x\ |
| cot|-| 2*cot |-| |
\ \2/ \2/ /
----------------------------------------------------
/x\
2*cot|-|
\2/
$$\frac{\left(\cot^{2}{\left(\frac{x}{2} \right)} + 1\right) \left(\frac{x \left(\cot^{2}{\left(\frac{x}{2} \right)} - 1\right)^{2}}{2 \cot^{2}{\left(\frac{x}{2} \right)}} + x - \frac{\cot^{2}{\left(\frac{x}{2} \right)} - 1}{\cot{\left(\frac{x}{2} \right)}}\right)}{2 \cot{\left(\frac{x}{2} \right)}}$$
/ 2\
| 2/x\ / 2/x\\ |
| 1 - tan |-| x*|1 - tan |-|| |
/ 2/x\\ | \2/ \ \2// |
|1 + tan |-||*|x - ----------- + ----------------|
\ \2// | /x\ 2/x\ |
| tan|-| 2*tan |-| |
\ \2/ \2/ /
--------------------------------------------------
/x\
2*tan|-|
\2/
$$\frac{\left(\tan^{2}{\left(\frac{x}{2} \right)} + 1\right) \left(\frac{x \left(1 - \tan^{2}{\left(\frac{x}{2} \right)}\right)^{2}}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + x - \frac{1 - \tan^{2}{\left(\frac{x}{2} \right)}}{\tan{\left(\frac{x}{2} \right)}}\right)}{2 \tan{\left(\frac{x}{2} \right)}}$$
2
sin(2*x) x*sin (2*x)
x - -------- + -----------
2 4
sin (x) 2*sin (x)
--------------------------
sin(x)
$$\frac{x + \frac{x \sin^{2}{\left(2 x \right)}}{2 \sin^{4}{\left(x \right)}} - \frac{\sin{\left(2 x \right)}}{\sin^{2}{\left(x \right)}}}{\sin{\left(x \right)}}$$
/ 2/x\\ / 2 2*x \
|1 + tan |-||*|x - ------ + -------|
\ \2// | tan(x) 2 |
\ tan (x)/
------------------------------------
/x\
2*tan|-|
\2/
$$\frac{\left(\tan^{2}{\left(\frac{x}{2} \right)} + 1\right) \left(x + \frac{2 x}{\tan^{2}{\left(x \right)}} - \frac{2}{\tan{\left(x \right)}}\right)}{2 \tan{\left(\frac{x}{2} \right)}}$$
/ 2/x\ 4/x\ \
| 2*sin |-| 2*x*sin |-| 2 |
| sin(x) \2/ \2/ x*sin (x)|
|- ---------- + --------- + ----------- + ---------|*sin(x)
| 1 - cos(x) sin(x) 2 4/x\|
| sin (x) 8*sin |-||
\ \2//
-----------------------------------------------------------
(1 - cos(x))*(1 + cos(x))
$$\frac{\left(\frac{2 x \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + \frac{x \sin^{2}{\left(x \right)}}{8 \sin^{4}{\left(\frac{x}{2} \right)}} + \frac{2 \sin^{2}{\left(\frac{x}{2} \right)}}{\sin{\left(x \right)}} - \frac{\sin{\left(x \right)}}{1 - \cos{\left(x \right)}}\right) \sin{\left(x \right)}}{\left(1 - \cos{\left(x \right)}\right) \left(\cos{\left(x \right)} + 1\right)}$$
/ 2/x\\ / 2 \
|1 + cot |-||*\x - 2*cot(x) + 2*x*cot (x)/
\ \2//
------------------------------------------
/x\
2*cot|-|
\2/
$$\frac{\left(\cot^{2}{\left(\frac{x}{2} \right)} + 1\right) \left(2 x \cot^{2}{\left(x \right)} + x - 2 \cot{\left(x \right)}\right)}{2 \cot{\left(\frac{x}{2} \right)}}$$
2 2*x
x - ------ + -------
tan(x) 2
tan (x)
--------------------
sin(x)
$$\frac{x + \frac{2 x}{\tan^{2}{\left(x \right)}} - \frac{2}{\tan{\left(x \right)}}}{\sin{\left(x \right)}}$$
/ 2/x\ 2/x\ \
| x*tan |-| x*cos |-| |
| 1 \2/ \2/ /x\| /x\
|- ------ + --------- + ---------- + tan|-||*sec|-|
| /x\ 2 1 - cos(x) \2/| \2/
| tan|-| |
\ \2/ /
---------------------------------------------------
/x\
2*sin|-|
\2/
$$\frac{\left(\frac{x \tan^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x \cos^{2}{\left(\frac{x}{2} \right)}}{1 - \cos{\left(x \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}\right) \sec{\left(\frac{x}{2} \right)}}{2 \sin{\left(\frac{x}{2} \right)}}$$
/ 2/x\ \
| x*sin |-| |
| 1 x \2/ /x\| /x\
|- ------ + --------- + ---------- + tan|-||*csc|-|
| /x\ 2/x\ 1 + cos(x) \2/| \2/
| tan|-| 2*tan |-| |
\ \2/ \2/ /
---------------------------------------------------
/x\
2*cos|-|
\2/
$$\frac{\left(\frac{x}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + \frac{x \sin^{2}{\left(\frac{x}{2} \right)}}{\cos{\left(x \right)} + 1} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}\right) \csc{\left(\frac{x}{2} \right)}}{2 \cos{\left(\frac{x}{2} \right)}}$$
/x\
x*tan|-|
1 x \2/
1 - ------- + --------- + --------
2/x\ 3/x\ 2
tan |-| 2*tan |-|
\2/ \2/
--------------------------------------
2 2
/ /x\\ / /x\\ 4/x\
2*|1 + tan|-|| *|-1 + tan|-|| *cos |-|
\ \4// \ \4// \4/
$$\frac{\frac{x \tan{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \tan^{3}{\left(\frac{x}{2} \right)}} + 1 - \frac{1}{\tan^{2}{\left(\frac{x}{2} \right)}}}{2 \left(\tan{\left(\frac{x}{4} \right)} - 1\right)^{2} \left(\tan{\left(\frac{x}{4} \right)} + 1\right)^{2} \cos^{4}{\left(\frac{x}{4} \right)}}$$
/ 2 2*x \
|x - ------ + -------|*csc(x)
| tan(x) 2 |
\ tan (x)/
$$\left(x + \frac{2 x}{\tan^{2}{\left(x \right)}} - \frac{2}{\tan{\left(x \right)}}\right) \csc{\left(x \right)}$$
/ 2/x\ \
| x*tan |-| |
| 1 x \2/ /x\| /x\
|- ------ + --------- + --------- + tan|-||*tan|-|
| /x\ 2/x\ 2 \2/| \2/
| tan|-| 2*tan |-| |
\ \2/ \2/ /
--------------------------------------------------
2/x\
2*sin |-|
\2/
$$\frac{\left(\frac{x \tan^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}\right) \tan{\left(\frac{x}{2} \right)}}{2 \sin^{2}{\left(\frac{x}{2} \right)}}$$
2
2*cos(x) 2*x*cos (x)
x - ----------- + ------------
/ pi\ 2/ pi\
cos|x - --| cos |x - --|
\ 2 / \ 2 /
------------------------------
/ pi\
cos|x - --|
\ 2 /
$$\frac{\frac{2 x \cos^{2}{\left(x \right)}}{\cos^{2}{\left(x - \frac{\pi}{2} \right)}} + x - \frac{2 \cos{\left(x \right)}}{\cos{\left(x - \frac{\pi}{2} \right)}}}{\cos{\left(x - \frac{\pi}{2} \right)}}$$
/ / pi\ 2/ pi\\
| 2*sec|x - --| 2*x*sec |x - --||
| \ 2 / \ 2 /| / pi\
|x - ------------- + ----------------|*sec|x - --|
| sec(x) 2 | \ 2 /
\ sec (x) /
$$\left(x + \frac{2 x \sec^{2}{\left(x - \frac{\pi}{2} \right)}}{\sec^{2}{\left(x \right)}} - \frac{2 \sec{\left(x - \frac{\pi}{2} \right)}}{\sec{\left(x \right)}}\right) \sec{\left(x - \frac{\pi}{2} \right)}$$
2/x\ x 3/x\
-2 + 2*tan |-| + ------ + x*tan |-|
\2/ /x\ \2/
tan|-|
\2/
-----------------------------------
2*(1 - cos(x))
$$\frac{x \tan^{3}{\left(\frac{x}{2} \right)} + \frac{x}{\tan{\left(\frac{x}{2} \right)}} + 2 \tan^{2}{\left(\frac{x}{2} \right)} - 2}{2 \left(1 - \cos{\left(x \right)}\right)}$$
2/x\
x*tan |-|
1 x \2/ /x\
- ------ + --------- + --------- + tan|-|
/x\ 2/x\ 2 \2/
tan|-| 2*tan |-|
\2/ \2/
-----------------------------------------
2/x\ /x\
2*cos |-|*tan|-|
\2/ \2/
$$\frac{\frac{x \tan^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}}{2 \cos^{2}{\left(\frac{x}{2} \right)} \tan{\left(\frac{x}{2} \right)}}$$
2/x\ 4/x\
2*sin |-| 2*x*sin |-| 2
\2/ sin(x) \2/ x*sin (x)
--------- - --------- + ----------- + ---------
sin(x) 2/x\ 2 4/x\
2*sin |-| sin (x) 8*sin |-|
\2/ \2/
-----------------------------------------------
sin(x)
$$\frac{\frac{2 x \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + \frac{x \sin^{2}{\left(x \right)}}{8 \sin^{4}{\left(\frac{x}{2} \right)}} + \frac{2 \sin^{2}{\left(\frac{x}{2} \right)}}{\sin{\left(x \right)}} - \frac{\sin{\left(x \right)}}{2 \sin^{2}{\left(\frac{x}{2} \right)}}}{\sin{\left(x \right)}}$$
2/x\ 2/x\
x*cos |-| x*sin |-|
1 \2/ \2/ /x\
- ------ + ---------- + ---------- + tan|-|
/x\ 1 - cos(x) 1 + cos(x) \2/
tan|-|
\2/
-------------------------------------------
/x\ /x\
2*cos|-|*sin|-|
\2/ \2/
$$\frac{\frac{x \sin^{2}{\left(\frac{x}{2} \right)}}{\cos{\left(x \right)} + 1} + \frac{x \cos^{2}{\left(\frac{x}{2} \right)}}{1 - \cos{\left(x \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}}{2 \sin{\left(\frac{x}{2} \right)} \cos{\left(\frac{x}{2} \right)}}$$
/ 2/x\ \
2 | x*tan |-| |
/ 2/x\\ | 1 x \2/ /x\|
|1 + tan |-|| *|- ------ + --------- + --------- + tan|-||
\ \4// | /x\ 2/x\ 2 \2/|
| tan|-| 2*tan |-| |
\ \2/ \2/ /
----------------------------------------------------------
2
/ 2/x\\ /x\
2*|1 - tan |-|| *tan|-|
\ \4// \2/
$$\frac{\left(\tan^{2}{\left(\frac{x}{4} \right)} + 1\right)^{2} \left(\frac{x \tan^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}\right)}{2 \left(1 - \tan^{2}{\left(\frac{x}{4} \right)}\right)^{2} \tan{\left(\frac{x}{2} \right)}}$$
/ /pi x\ /x\ 2/pi x\ 2/x\ \
|csc|-- - -| csc|-| x*csc |-- - -| x*csc |-| |
| \2 2/ \2/ \2 2/ \2/ | /x\ /pi x\
|----------- - ----------- + -------------- + --------------|*csc|-|*csc|-- - -|
| /x\ /pi x\ 2/x\ 2/pi x\| \2/ \2 2/
| csc|-| csc|-- - -| 2*csc |-| 2*csc |-- - -||
\ \2/ \2 2/ \2/ \2 2//
--------------------------------------------------------------------------------
2
$$\frac{\left(\frac{x \csc^{2}{\left(\frac{x}{2} \right)}}{2 \csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}} + \frac{x \csc^{2}{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}}{2 \csc^{2}{\left(\frac{x}{2} \right)}} - \frac{\csc{\left(\frac{x}{2} \right)}}{\csc{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}} + \frac{\csc{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}}{\csc{\left(\frac{x}{2} \right)}}\right) \csc{\left(\frac{x}{2} \right)} \csc{\left(- \frac{x}{2} + \frac{\pi}{2} \right)}}{2}$$
/ 2 \
| 2*csc(x) 2*x*csc (x) |
|x - ----------- + ------------|*csc(x)
| /pi \ 2/pi \|
| csc|-- - x| csc |-- - x||
\ \2 / \2 //
$$\left(\frac{2 x \csc^{2}{\left(x \right)}}{\csc^{2}{\left(- x + \frac{\pi}{2} \right)}} + x - \frac{2 \csc{\left(x \right)}}{\csc{\left(- x + \frac{\pi}{2} \right)}}\right) \csc{\left(x \right)}$$
/ / pi\ 2/ pi\\
| 2*sec|x - --| 2*x*sec |x - --||
| \ 2 / \ 2 /| /pi \
|x - ------------- + ----------------|*sec|-- - x|
| sec(x) 2 | \2 /
\ sec (x) /
$$\left(x + \frac{2 x \sec^{2}{\left(x - \frac{\pi}{2} \right)}}{\sec^{2}{\left(x \right)}} - \frac{2 \sec{\left(x - \frac{\pi}{2} \right)}}{\sec{\left(x \right)}}\right) \sec{\left(- x + \frac{\pi}{2} \right)}$$
/ pi\ 2/ pi\
2*sin|x + --| 2*x*sin |x + --|
\ 2 / \ 2 /
x - ------------- + ----------------
sin(x) 2
sin (x)
------------------------------------
sin(x)
$$\frac{x + \frac{2 x \sin^{2}{\left(x + \frac{\pi}{2} \right)}}{\sin^{2}{\left(x \right)}} - \frac{2 \sin{\left(x + \frac{\pi}{2} \right)}}{\sin{\left(x \right)}}}{\sin{\left(x \right)}}$$
2/x\ 4/x\
2*sin |-| 2*x*sin |-| 2
sin(x) \2/ \2/ x*sin (x)
- ---------- + --------- + ----------- + ---------
1 - cos(x) sin(x) 2 4/x\
sin (x) 8*sin |-|
\2/
--------------------------------------------------
sin(x)
$$\frac{\frac{2 x \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + \frac{x \sin^{2}{\left(x \right)}}{8 \sin^{4}{\left(\frac{x}{2} \right)}} + \frac{2 \sin^{2}{\left(\frac{x}{2} \right)}}{\sin{\left(x \right)}} - \frac{\sin{\left(x \right)}}{1 - \cos{\left(x \right)}}}{\sin{\left(x \right)}}$$
/ 2 \
| 2*csc(x) 2*x*csc (x)|
|x - -------- + -----------|*csc(x)
| sec(x) 2 |
\ sec (x) /
$$\left(\frac{2 x \csc^{2}{\left(x \right)}}{\sec^{2}{\left(x \right)}} + x - \frac{2 \csc{\left(x \right)}}{\sec{\left(x \right)}}\right) \csc{\left(x \right)}$$
/ 2/x\\
2 | x*cot |-||
/ 2/x\\ | 1 /x\ x \2/| /x\
|1 + cot |-|| *|------ - cot|-| + --------- + ---------|*cot|-|
\ \4// | /x\ \2/ 2/x\ 2 | \2/
|cot|-| 2*cot |-| |
\ \2/ \2/ /
---------------------------------------------------------------
2
/ 2/x\\
2*|-1 + cot |-||
\ \4//
$$\frac{\left(\cot^{2}{\left(\frac{x}{4} \right)} + 1\right)^{2} \left(\frac{x \cot^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \cot^{2}{\left(\frac{x}{2} \right)}} - \cot{\left(\frac{x}{2} \right)} + \frac{1}{\cot{\left(\frac{x}{2} \right)}}\right) \cot{\left(\frac{x}{2} \right)}}{2 \left(\cot^{2}{\left(\frac{x}{4} \right)} - 1\right)^{2}}$$
/ 2/x\\
2 | x*cot |-||
/ 2/x\\ | 1 /x\ x \2/|
|1 + cot |-|| *|------ - cot|-| + --------- + ---------|
\ \4// | /x\ \2/ 2/x\ 2 |
|cot|-| 2*cot |-| |
\ \2/ \2/ /
--------------------------------------------------------
/x\ 2/x\
8*cot|-|*cot |-|
\2/ \4/
$$\frac{\left(\cot^{2}{\left(\frac{x}{4} \right)} + 1\right)^{2} \left(\frac{x \cot^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \cot^{2}{\left(\frac{x}{2} \right)}} - \cot{\left(\frac{x}{2} \right)} + \frac{1}{\cot{\left(\frac{x}{2} \right)}}\right)}{8 \cot^{2}{\left(\frac{x}{4} \right)} \cot{\left(\frac{x}{2} \right)}}$$
/ 2/x\ \
2 | x*tan |-| |
/ 2/x\\ | 1 x \2/ /x\| /x\
|1 + tan |-|| *|- ------ + --------- + --------- + tan|-||*tan|-|
\ \4// | /x\ 2/x\ 2 \2/| \2/
| tan|-| 2*tan |-| |
\ \2/ \2/ /
-----------------------------------------------------------------
2/x\
8*tan |-|
\4/
$$\frac{\left(\tan^{2}{\left(\frac{x}{4} \right)} + 1\right)^{2} \left(\frac{x \tan^{2}{\left(\frac{x}{2} \right)}}{2} + \frac{x}{2 \tan^{2}{\left(\frac{x}{2} \right)}} + \tan{\left(\frac{x}{2} \right)} - \frac{1}{\tan{\left(\frac{x}{2} \right)}}\right) \tan{\left(\frac{x}{2} \right)}}{8 \tan^{2}{\left(\frac{x}{4} \right)}}$$
/ 2/x\ 4/x\ \
|2*sin |-| 2*x*sin |-| 2 |
| \2/ sin(x) \2/ x*sin (x)|
|--------- - --------- + ----------- + ---------|*sin(x)
| sin(x) 2/x\ 2 4/x\|
| 2*sin |-| sin (x) 8*sin |-||
\ \2/ \2//
--------------------------------------------------------
2/x\ 2/pi x\
4*sin |-|*sin |-- + -|
\2/ \2 2/
$$\frac{\left(\frac{2 x \sin^{4}{\left(\frac{x}{2} \right)}}{\sin^{2}{\left(x \right)}} + \frac{x \sin^{2}{\left(x \right)}}{8 \sin^{4}{\left(\frac{x}{2} \right)}} + \frac{2 \sin^{2}{\left(\frac{x}{2} \right)}}{\sin{\left(x \right)}} - \frac{\sin{\left(x \right)}}{2 \sin^{2}{\left(\frac{x}{2} \right)}}\right) \sin{\left(x \right)}}{4 \sin^{2}{\left(\frac{x}{2} \right)} \sin^{2}{\left(\frac{x}{2} + \frac{\pi}{2} \right)}}$$
2*cos(x) 2*x
-x - -------- + -------
sin(x) 2
sin (x)
-----------------------
sin(x)
$$\frac{- x + \frac{2 x}{\sin^{2}{\left(x \right)}} - \frac{2 \cos{\left(x \right)}}{\sin{\left(x \right)}}}{\sin{\left(x \right)}}$$
/x pi\ /x\ 2/x pi\ 2/x\
cos|- - --| cos|-| x*cos |- - --| x*cos |-|
\2 2 / \2/ \2 2 / \2/
----------- - ----------- + -------------- + --------------
/x\ /x pi\ 2/x\ 2/x pi\
cos|-| cos|- - --| 2*cos |-| 2*cos |- - --|
\2/ \2 2 / \2/ \2 2 /
-----------------------------------------------------------
/x\ /x pi\
2*cos|-|*cos|- - --|
\2/ \2 2 /
$$\frac{\frac{x \cos^{2}{\left(\frac{x}{2} \right)}}{2 \cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + \frac{x \cos^{2}{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{2 \cos^{2}{\left(\frac{x}{2} \right)}} - \frac{\cos{\left(\frac{x}{2} \right)}}{\cos{\left(\frac{x}{2} - \frac{\pi}{2} \right)}} + \frac{\cos{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}{\cos{\left(\frac{x}{2} \right)}}}{2 \cos{\left(\frac{x}{2} \right)} \cos{\left(\frac{x}{2} - \frac{\pi}{2} \right)}}$$
(cos(x/2 - pi/2)/cos(x/2) - cos(x/2)/cos(x/2 - pi/2) + x*cos(x/2 - pi/2)^2/(2*cos(x/2)^2) + x*cos(x/2)^2/(2*cos(x/2 - pi/2)^2))/(2*cos(x/2)*cos(x/2 - pi/2))