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数学
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计算sin(α-π/4)+cos(α+π/4)的值.
人气:259 ℃ 时间:2020-05-09 17:53:45
解答
cos(α+π/4)=cos(a-π/4+π/2)
=-sin(a-π/4)
所以sin(α-π/4)+cos(α+π/4)=0
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