Don't know the steps in finding this derivative.
But the derivative is
The answer is:
2 / 2 / 2 \ \ cot (x) |cot (x)*\1 + tan (x)/ / 2 \ | (tan(x)) *|--------------------- + \-2 - 2*cot (x)/*cot(x)*log(tan(x))| \ tan(x) /
/ 2 2 \ 2 |/ / 2 \ \ 2 / 2 \ 2 / 2 \ / 2 \ | cot (x) || / 2 \ \1 + tan (x)/*cot(x)| 2 / 2 \ 2 / 2 \ \1 + tan (x)/ *cot (x) 2 / 2 \ 4*\1 + cot (x)/*\1 + tan (x)/*cot(x)| (tan(x)) *||- 2*\1 + cot (x)/*log(tan(x)) + --------------------| *cot (x) + 2*\1 + cot (x)/ *log(tan(x)) + 2*cot (x)*\1 + tan (x)/ - ---------------------- + 4*cot (x)*\1 + cot (x)/*log(tan(x)) - ------------------------------------| |\ tan(x) / 2 tan(x) | \ tan (x) /
/ 3 2 3 / 2 \ 2 2 \ 2 |/ / 2 \ \ 2 / 2 \ 2 / 2 \ 2 / / 2 \ \ | 2 / 2 \ 2 / 2 \ / 2 \ | / 2 \ / 2 \ / 2 \ / 2 \ 2 / 2 \ / 2 \| cot (x) || / 2 \ \1 + tan (x)/*cot(x)| 3 / 2 \ / 2 \ / 2 \ 3 / 2 \ 4*\1 + tan (x)/ *cot (x) 2*\1 + tan (x)/ *cot (x) | / 2 \ \1 + tan (x)/*cot(x)| | / 2 \ 2 / 2 \ \1 + tan (x)/ *cot (x) 2 / 2 \ 4*\1 + cot (x)/*\1 + tan (x)/*cot(x)| 2 / 2 \ 6*\1 + cot (x)/ *\1 + tan (x)/ 6*\1 + tan (x)/ *\1 + cot (x)/*cot(x) 12*cot (x)*\1 + cot (x)/*\1 + tan (x)/| (tan(x)) *||- 2*\1 + cot (x)/*log(tan(x)) + --------------------| *cot (x) - 16*\1 + cot (x)/ *cot(x)*log(tan(x)) - 12*\1 + cot (x)/*\1 + tan (x)/*cot(x) - 8*cot (x)*\1 + cot (x)/*log(tan(x)) - ------------------------ + ------------------------ + 3*|- 2*\1 + cot (x)/*log(tan(x)) + --------------------|*|2*\1 + cot (x)/ *log(tan(x)) + 2*cot (x)*\1 + tan (x)/ - ---------------------- + 4*cot (x)*\1 + cot (x)/*log(tan(x)) - ------------------------------------|*cot(x) + 4*cot (x)*\1 + tan (x)/*tan(x) + ------------------------------ + ------------------------------------- + --------------------------------------| |\ tan(x) / tan(x) 3 \ tan(x) / | 2 tan(x) | tan(x) 2 tan(x) | \ tan (x) \ tan (x) / tan (x) /
/ 3 2 3 / 2 \ 2 2 \ 2 |/ / 2 \ \ 2 / 2 \ 2 / 2 \ 2 / / 2 \ \ | 2 / 2 \ 2 / 2 \ / 2 \ | / 2 \ / 2 \ / 2 \ / 2 \ 2 / 2 \ / 2 \| cot (x) || / 2 \ \1 + tan (x)/*cot(x)| 3 / 2 \ / 2 \ / 2 \ 3 / 2 \ 4*\1 + tan (x)/ *cot (x) 2*\1 + tan (x)/ *cot (x) | / 2 \ \1 + tan (x)/*cot(x)| | / 2 \ 2 / 2 \ \1 + tan (x)/ *cot (x) 2 / 2 \ 4*\1 + cot (x)/*\1 + tan (x)/*cot(x)| 2 / 2 \ 6*\1 + cot (x)/ *\1 + tan (x)/ 6*\1 + tan (x)/ *\1 + cot (x)/*cot(x) 12*cot (x)*\1 + cot (x)/*\1 + tan (x)/| (tan(x)) *||- 2*\1 + cot (x)/*log(tan(x)) + --------------------| *cot (x) - 16*\1 + cot (x)/ *cot(x)*log(tan(x)) - 12*\1 + cot (x)/*\1 + tan (x)/*cot(x) - 8*cot (x)*\1 + cot (x)/*log(tan(x)) - ------------------------ + ------------------------ + 3*|- 2*\1 + cot (x)/*log(tan(x)) + --------------------|*|2*\1 + cot (x)/ *log(tan(x)) + 2*cot (x)*\1 + tan (x)/ - ---------------------- + 4*cot (x)*\1 + cot (x)/*log(tan(x)) - ------------------------------------|*cot(x) + 4*cot (x)*\1 + tan (x)/*tan(x) + ------------------------------ + ------------------------------------- + --------------------------------------| |\ tan(x) / tan(x) 3 \ tan(x) / | 2 tan(x) | tan(x) 2 tan(x) | \ tan (x) \ tan (x) / tan (x) /