化简:1+sina+cosa+2sinacosa/1+sina+cosa

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化简:1+sina+cosa+2sinacosa/1+sina+cosa
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化简:1+sina+cosa+2sinacosa/1+sina+cosa
化简:1+sina+cosa+2sinacosa/1+sina+cosa

化简:1+sina+cosa+2sinacosa/1+sina+cosa
(1+sina+cosa+2sinacosa)/(1+sina+cosa)
=[﹙sin²a+cos²a+2sinacosa﹚+sina+cosa]/(1+sina+cosa)
=[(sina+cosa)²+1×(sina+cosa)]/(1+sina+cosa)
=(sina+cosa+1)(sina+cosa)/(1+sina+cosa)
=sina+cosa