[微積] 一題反三角函數的微分怪怪的
設 f(x) = arctan[(1+tanx)/(1-tanx)],x 不等於 pi/4,求 f'(x)
我是直接微得到 f'(x) = 1, 但是這樣不就代表 f(x) = x?
這應該不太可能吧......
算了三四次它的微分都是 1
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