Question

Решите уравнение
сos2x-cos6x=0

Answer 1

Решение
сos2x-cos6x=0
2*(sin4x)*(sin3x) = 0
sin4x = 0
4x = πn, n∈Z
x = 1/4*(πn), n∈Z
sin3x = 0
3x = πk, k∈Z
x =(1/3)* πk, k∈Z