∫(tanx)^2*dx

Written by MGhostSoft
下面是我与小罗的短信。
罗：tan^2x怎么积？
我：tanx-x+C。你们都学到积分了？
罗：没有，我自己看的。
我：你居然有时间看！
罗：是呀，平时整天都忙着玩游戏，好不容易上课了没事做了才得闲看。

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