化简2cos^a/sin2a乘1-cos2a/cos2a的结果
问题描述:
化简2cos^a/sin2a乘1-cos2a/cos2a的结果
答
1-cos2a=2sin^2a
2cos^a/sin2a乘1-cos2a/cos2a
=2cos^2a*2sin^2a/sin2a*cos2a
=sin2a/cos2a
=tan2a