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数学
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①:已知sin(π+α)=-1/3,求cos(5π+α)的值;②:已知sin(π/3+α)=-1/2,求sin(α-5π/3)的值.
人气:201 ℃ 时间:2020-04-10 19:32:41
解答
cos(5π+a)=cos(π+a)=+ - 2根号2/3
sin(a-5π/3)=sin(a-5π/3+2π)=sin(a+π/3)=-1/2
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