Question

Помогите
Cos6x=cosx

Answer 1

Ответ:

cos(6x)=cos(x)

cos(6x)-cos(x)=0

-2sin(7x/2)sin(5x/2)=0

sin(7x/2)sin(5x/2)

sin(7x/2)=0

x=2kn/7, k=€Z

sin(5x/2)=0

x=2kn/5, k€Z