cos(3π/2-α)=sinα
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cos(3π/2-α)=sinαcos(3π/2-α)=sinαcos(3π/2-α)=sinα不对.是-sinα.不对,cos(3π/2-α)=-sinα
cos(3π/2-α)=sinα
cos(3π/2-α)=sinα
cos(3π/2-α)=sinα
不对.是-sinα.
不对,cos(3π/2-α)=-sinα
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