1.化简sin²α+cosαcos(π/3+α)-

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1sin²α+cosαcos(π/3+α)-sin²(π/6-α)=sin²α+cosα(cosπ/3cosα-sinπ/3sina)-(sinπ/6cosα-cosπ/6sina)²=sin²α+cosα(1/2cosα-√3/2sina)-(1/2cosa-√3/2sina)²=sin²...

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化简（1）sin(α+π)cos(-α)sin(-α-π) （2）sin³（-α）cos（2π+α）tan（-
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