2sinacosa/sin2a-cos2a 怎么化简,

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2sinacosa/sin2a-cos2a 怎么化简,
2sinacosa/sin2a-cos2a 怎么化简,

2sinacosa/sin2a-cos2a 怎么化简,
2sinacosa/sin2a-cos2a
是2sinacosa/sin²a-cos²a 吧
2sinacosa/sin²a-cos²a
=-sin2a/(cos²a-sin²a)
=-sin2a/cos2a
=-tan2a

2sinacosa/(sin²a-cos²a)
=sin(2a)/[-cos(2a)]
=-tan(2a)