sinA+cosA=1/5,求tanA=?
sinA+cosA=1/5,求tanA=?
數(shù)學人氣：328 ℃時間：2020-06-19 04:33:46
優(yōu)質(zhì)解答
(sina+cosa)'2=(tana'2+2tana+1)/(tana'2+1)=1/25
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