已知-π/2

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已知-π/2已知-π/2已知-π/2sin(a-π/6)=sin(-π/4+2kπ)yinwei:-π/2

已知-π/2
已知-π/2

已知-π/2
sin(a-π/6)=sin(-π/4+2kπ) yinwei :-π/2

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