Ребята, помогите решить 3 задание!!!

x=3π/2+y sin(3π/2+y)-cosy=-√2 -cosy-cosy=-√2 -2cosy=-√2 cosy=√2/2 y=+-arcos√2/2 +2πn, n∈Z y=+-π/4+2πn x=3π/2+y=+-π/4+3π/2+2πn