Question

решить уравнение:

1) cos (x+3п)=0
2) cos (5/2 п + x)=0

Answer 1

1) x + 3π = π/2 + πk
x = π/2 - 3π + πk
x = -5π/2 + πk

2) 5π/2 + x = π/2 + πk
x = π/2 - 5π/2 + πk
x = -2π + πk