化简2cos^a/sin2a乘1-cos2a/cos2a的结果
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化简2cos^a/sin2a乘1-cos2a/cos2a的结果
化简2cos^a/sin2a乘1-cos2a/cos2a的结果
化简2cos^a/sin2a乘1-cos2a/cos2a的结果
1-cos2a=2sin^2a
2cos^a/sin2a乘1-cos2a/cos2a
=2cos^2a*2sin^2a/sin2a*cos2a
=sin2a/cos2a
=tan2a