求证(1-2sinacosa)/(cos^2 2θ-sin^2 2θ)=(1-tana)/(1+tana)如题
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求证(1-2sinacosa)/(cos^2 2θ-sin^2 2θ)=(1-tana)/(1+tana)如题
求证(1-2sinacosa)/(cos^2 2θ-sin^2 2θ)=(1-tana)/(1+tana)
如题
求证(1-2sinacosa)/(cos^2 2θ-sin^2 2θ)=(1-tana)/(1+tana)如题
求证(1-2sinacosa)/(cos^2 θ-sin^2 θ)=(1-tana)/(1+tana)
证明:
(1-2sinacosa)/(cos^2 θ-sin^2 θ)
=(cosa-sina)^2/[(cosa-sina)(cosa+sina)]
=(cosa-sina)/(cosa+sina),上下除以cosa
=(1-tana)/(1+tana)
=右边
题目是不是有问题:应该为:
求证(1-2sinacosa)/(cos^2 a-sin^2 a)=(1-tana)/(1+tana)
证明:(1-2sinacosa)/(cos^2 a-sin^2 a)
=(sin^2a+cos^2a-2sinacosa)/(cos^2 a-sin^2 a)
=(cosa-sina)^2/[(cosa-sina)(cosa+sina)]
=(cosa-sina)/(cosa+sina)
=(1-tana)/(1+tana)
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求证(1-2sinacosa)/(cos^2 2θ-sin^2 2θ)=(1-tana)/(1+tana)如题
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怎么证1-2sinacosa/cos^2a-sin^2a=cos^2a-sin^2a/1+2sinacosa
tana=1/3,sin^2-sinacosa-cos^2a=?tana=1/3,sin^2-sinacosa-cos^2a=?详细写出思路