Cos(2x-π18)=0
Sin(x5+π12)=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
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