sin²α+sin2α/cos²α+cos2α化简谢谢了在线等
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sin²α+sin2α/cos²α+cos2α化简谢谢了在线等
sin²α+sin2α/cos²α+cos2α化简谢谢了在线等
sin²α+sin2α/cos²α+cos2α化简谢谢了在线等
(sin²α+sin2α)/(cos²α+cos2α)
=(sin²α+2sinαcosα)/(2cos²α-sin²α)
=(tan²α+2tanα)/(1-tan²α)
= tan²α/(1-tan²α) + (2tanα)/(1-tan²α)
= tan²α/(1-tan²α) +tan2α