已知sinx+cosx=(根号3-1)/2,求tanx我知道答案是-根号3或-根号3/3可是我用sinxcosx=-根号3/4sinx=-根号3/4*cosx3/16cos^2x+cos^x=1cos^2x=16/19;sin^2x=3/16再算tan,我为什么算不出答案(解法我知道了,
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![已知sinx+cosx=(根号3-1)/2,求tanx我知道答案是-根号3或-根号3/3可是我用sinxcosx=-根号3/4sinx=-根号3/4*cosx3/16cos^2x+cos^x=1cos^2x=16/19;sin^2x=3/16再算tan,我为什么算不出答案(解法我知道了,](/uploads/image/z/193341-21-1.jpg?t=%E5%B7%B2%E7%9F%A5sinx%2Bcosx%3D%28%E6%A0%B9%E5%8F%B73-1%29%2F2%2C%E6%B1%82tanx%E6%88%91%E7%9F%A5%E9%81%93%E7%AD%94%E6%A1%88%E6%98%AF-%E6%A0%B9%E5%8F%B73%E6%88%96-%E6%A0%B9%E5%8F%B73%2F3%E5%8F%AF%E6%98%AF%E6%88%91%E7%94%A8sinxcosx%3D-%E6%A0%B9%E5%8F%B73%2F4sinx%3D-%E6%A0%B9%E5%8F%B73%2F4%2Acosx3%2F16cos%5E2x%2Bcos%5Ex%3D1cos%5E2x%3D16%2F19%EF%BC%9Bsin%5E2x%3D3%2F16%E5%86%8D%E7%AE%97tan%2C%E6%88%91%E4%B8%BA%E4%BB%80%E4%B9%88%E7%AE%97%E4%B8%8D%E5%87%BA%E7%AD%94%E6%A1%88%EF%BC%88%E8%A7%A3%E6%B3%95%E6%88%91%E7%9F%A5%E9%81%93%E4%BA%86%2C)
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