(2sin²α+2sinα*cosα)/(1+tanα)=(2sin²α+2sinα*cosα)/1+(sinα/cosα)=(2sin²αcosα+2sinα*cos²α)/cosα+sinα=2sinαcosα(cosα+sinα)/(cosα+sinα)=2sinαcosα
(2sin²α+2sinα*cosα)/(1+tanα) 的值如何进行化简
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