Don't know the steps in finding this derivative.
But the derivative is
The answer is:
atan(5*x) /5*log(cos(2*x - 5)) 2*atan(5*x)*sin(2*x - 5)\ cos (2*x - 5)*|------------------- - ------------------------| | 2 cos(2*x - 5) | \ 1 + 25*x /
/ 2 2 \ atan(5*x) |/ 5*log(cos(-5 + 2*x)) 2*atan(5*x)*sin(-5 + 2*x)\ 250*x*log(cos(-5 + 2*x)) 20*sin(-5 + 2*x) 4*sin (-5 + 2*x)*atan(5*x)| cos (-5 + 2*x)*||- -------------------- + -------------------------| - 4*atan(5*x) - ------------------------ - ------------------------- - --------------------------| || 2 cos(-5 + 2*x) | 2 / 2\ 2 | |\ 1 + 25*x / / 2\ \1 + 25*x /*cos(-5 + 2*x) cos (-5 + 2*x) | \ \1 + 25*x / /
/ 3 / 2 \ 2 3 2 \ atan(5*x) | / 5*log(cos(-5 + 2*x)) 2*atan(5*x)*sin(-5 + 2*x)\ 60 250*log(cos(-5 + 2*x)) / 5*log(cos(-5 + 2*x)) 2*atan(5*x)*sin(-5 + 2*x)\ | 2*sin (-5 + 2*x)*atan(5*x) 10*sin(-5 + 2*x) 125*x*log(cos(-5 + 2*x))| 60*sin (-5 + 2*x) 16*atan(5*x)*sin(-5 + 2*x) 16*sin (-5 + 2*x)*atan(5*x) 25000*x *log(cos(-5 + 2*x)) 1500*x*sin(-5 + 2*x) | cos (-5 + 2*x)*|- |- -------------------- + -------------------------| - --------- - ---------------------- + 6*|- -------------------- + -------------------------|*|2*atan(5*x) + -------------------------- + ------------------------- + ------------------------| - -------------------------- - -------------------------- - --------------------------- + --------------------------- + --------------------------| | | 2 cos(-5 + 2*x) | 2 2 | 2 cos(-5 + 2*x) | | 2 / 2\ 2 | / 2\ 2 cos(-5 + 2*x) 3 3 2 | | \ 1 + 25*x / 1 + 25*x / 2\ \ 1 + 25*x / | cos (-5 + 2*x) \1 + 25*x /*cos(-5 + 2*x) / 2\ | \1 + 25*x /*cos (-5 + 2*x) cos (-5 + 2*x) / 2\ / 2\ | \ \1 + 25*x / \ \1 + 25*x / / \1 + 25*x / \1 + 25*x / *cos(-5 + 2*x)/