Question

Найти производную косинус в квадрате два икс

Answer 1

y ' = (cos2x * cos2x) ' 

y ' = (cos2x)'cos2x + (cos2x)' cos2x = 
= - 2sin2x cos2x - 2sin2xcos2x = 
= - 4sin2x cos2x = 
= - 2*2sin2x* cos2x = 
= - 2sin4x