решите уравнение

cos (x - π/2) = 0

Cos(x - π/2) = 0

We can use the identity cos(π/2 - θ) = sin(θ) to rewrite the equation as:

sin(x) = 0

This equation is satisfied when x is a multiple of π. Therefore, the solution set is:

x = πk, where k is an integer.