化简(sinx)^2*tanx+(cosx)^2*cotx+2sinx*cosx在线等O(∩_∩)O谢谢
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化简(sinx)^2*tanx+(cosx)^2*cotx+2sinx*cosx在线等O(∩_∩)O谢谢
化简(sinx)^2*tanx+(cosx)^2*cotx+2sinx*cosx在线等O(∩_∩)O谢谢
化简(sinx)^2*tanx+(cosx)^2*cotx+2sinx*cosx在线等O(∩_∩)O谢谢
(sinx)^2*tanx+(cosx)^2*cotx+2sinx*cosx
=(sinx)^3/cosx+(cosx)^3/sinx+2sinx*cosx
=[(sinx)^4+(cosx)^4+2(sinx)^2*(cosx)^2]/(sinxcosx)
=[(sinx)^2+(cosx)^2]^2/(sinxcosx)
=2/sin2x
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