Question

Cos(2x-π\18)=0
Sin(x\5+π\12)=1

Answer 1

1) 2x - π/18 = π/2 +πn
2x = 5π/9 +πn
x = 5π/18 + πn/2
n∈Z
2) x/5 + π/12 = π/2 + 2πn
x/5 = 5π/12 + 2πn
x = 25π/12 + 10πn
n∈Z