______________ ________ \/ 1 + x*sin(x) - \/ cos(x)
d / ______________ ________\ --\\/ 1 + x*sin(x) - \/ cos(x) / dx
Differentiate term by term:
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
Differentiate term by term:
The derivative of the constant is zero.
Apply the product rule:
; to find :
Apply the power rule: goes to
; to find :
The derivative of sine is cosine:
The result is:
The result is:
The result of the chain rule is:
The derivative of a constant times a function is the constant times the derivative of the function.
Let .
Apply the power rule: goes to
Then, apply the chain rule. Multiply by :
The derivative of cosine is negative sine:
The result of the chain rule is:
So, the result is:
The result is:
Now simplify:
The answer is:
sin(x) x*cos(x) ------ + -------- 2 2 sin(x) ----------------- + ------------ ______________ ________ \/ 1 + x*sin(x) 2*\/ cos(x)
2 2 ________ sin (x) (x*cos(x) + sin(x)) 2*(-2*cos(x) + x*sin(x)) 2*\/ cos(x) + --------- - -------------------- - ------------------------ 3/2 3/2 ______________ cos (x) (1 + x*sin(x)) \/ 1 + x*sin(x) -------------------------------------------------------------------------- 4
3 3 4*(3*sin(x) + x*cos(x)) 2*sin(x) 3*(x*cos(x) + sin(x)) 3*sin (x) 6*(-2*cos(x) + x*sin(x))*(x*cos(x) + sin(x)) - ----------------------- + ---------- + ---------------------- + --------- + -------------------------------------------- ______________ ________ 5/2 5/2 3/2 \/ 1 + x*sin(x) \/ cos(x) (1 + x*sin(x)) cos (x) (1 + x*sin(x)) -------------------------------------------------------------------------------------------------------------------------- 8