已知a属于(0,π/2),且sina+cosa=tana-1/tana求sina乘cosa的值
人气：321 ℃ 时间：2020-05-21 06:31:50
解答
sina+cosa=tana-1/tanasina+cosa=sina/cosa-cosa/sinasina+cosa=(sin²a-cos²a)/sinacosa1=(sina-cosa)/sinacosasinacosa=sina-cosa(sinacosa)²=sin²a+coa²a-2sinacosa(sinacosa)²+2si...
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