∫(tanx)^2*dx

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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