2sin2acos^a/(1+cos2a)cos2a
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2sin2acos^a/(1+cos2a)cos2a
2sin2acos^a/(1+cos2a)cos2a
2sin2acos^a/(1+cos2a)cos2a
原式=2sin2acos²a/(1+2cos²a-1)cos2a
=2sin2acos²a/2cos²acos2a
=sin2a/cos2a
=tan2a