Question

решить уравнение cos(2x-пи/2)=0

Answer 1

cos(2x -π/2) = 0 ;
2x -π/2 = π/2+π*k , k ∈Z ;
2x = π + π*k , k ∈Z  ;
x = π(1 +k)/2  , k ∈Z  .