Question

помогите решить выражение cos(pi/6 - 2x)= -1

Answer 1

cos(π/6 - 2x) = - 1
cos(2x - π/6) = - 1
2x - π/6 = π + 2πk, k∈Z
2x =  π/6 + π + 2πk, k∈Z
2x =  7π/6 + 2πk, k∈Z
x =  7π/12 + πk, k∈Z