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已知tan(3π/2 + α)=根号下3,那么cos(α+7/2π)=
人气:358 ℃ 时间:2020-09-13 03:37:55
解答
tan(3/2π+α) =√3;
tan(π+π/2+a)=tan(π/2+a)=-cota=√3;
cos(α+7/2π)=cos(a+3π/2+2π)=cos(a+3π/2)
=cos(a+π/2+π)=-cos(a+π/2)=sina=1/2
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