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sinxcosπ/8+cosxsinπ/8=1/2
sin(x+π/8)=1/2
x+π/8=π/6 +2kπ ∨ x+π/8=π-π/6+2kπ
x=π/24+2kπ ∨ x=17/24)π+2kπ, k∈C
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