1、已知sinA等于5分之1,求cosA,tanA的值.
人气:425 ℃ 时间:2019-12-29 21:45:51
解答
sin²A+cos²A=1
sinA=1/5
所以cosA=±2√6/5
tanA=sinA/cosA
所以
cosA=-2√6/5,tanA=-√6/12
或cosA=2√6/5,tanA=√6/12
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