k是奇数,-sinα=cosα
k是偶数,sinα=-cosα
sin(α+45`)=0
α+π/4=kπ
α=kπ-π/4与你的结果是一个意思.
sin( α+kπ)=cos(α+π+kπ),则α的值是?
0
0
1个回答
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00
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