化简:cos^2(a+45度)-sin^2(a+45度)cos^2(a+45度)-sin^2(a+45度)=(cosacos45°-sinasin45°)²-(sinacos45+cosasin45)²=1/2(cosa-sina)²-1/2(sina+cosa)²=2sinacosa=sin2a最后两步怎么来的0.0
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![化简:cos^2(a+45度)-sin^2(a+45度)cos^2(a+45度)-sin^2(a+45度)=(cosacos45°-sinasin45°)²-(sinacos45+cosasin45)²=1/2(cosa-sina)²-1/2(sina+cosa)²=2sinacosa=sin2a最后两步怎么来的0.0](/uploads/image/z/8798105-65-5.jpg?t=%E5%8C%96%E7%AE%80%3Acos%5E2%28a%2B45%E5%BA%A6%29-sin%5E2%28a%2B45%E5%BA%A6%29cos%5E2%28a%2B45%E5%BA%A6%29-sin%5E2%28a%2B45%E5%BA%A6%29%3D%28cosacos45%C2%B0-sinasin45%C2%B0%29%26%23178%3B-%28sinacos45%2Bcosasin45%29%26%23178%3B%3D1%2F2%28cosa-sina%29%26%23178%3B-1%2F2%28sina%2Bcosa%29%26%23178%3B%3D2sinacosa%3Dsin2a%E6%9C%80%E5%90%8E%E4%B8%A4%E6%AD%A5%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%840.0)
化简:cos^2(a+45度)-sin^2(a+45度)cos^2(a+45度)-sin^2(a+45度)=(cosacos45°-sinasin45°)²-(sinacos45+cosasin45)²=1/2(cosa-sina)²-1/2(sina+cosa)²=2sinacosa=sin2a最后两步怎么来的0.0
化简:cos^2(a+45度)-sin^2(a+45度)
cos^2(a+45度)-sin^2(a+45度)
=(cosacos45°-sinasin45°)²-(sinacos45+cosasin45)²
=1/2(cosa-sina)²-1/2(sina+cosa)²
=2sinacosa
=sin2a
最后两步怎么来的0.0
化简:cos^2(a+45度)-sin^2(a+45度)cos^2(a+45度)-sin^2(a+45度)=(cosacos45°-sinasin45°)²-(sinacos45+cosasin45)²=1/2(cosa-sina)²-1/2(sina+cosa)²=2sinacosa=sin2a最后两步怎么来的0.0
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