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The domain of the derivative of the func...

The domain of the derivative of the function `f(x)={t a n^(-1)x ,if|x|lt=1 and 1/2(|x|-1),if|x|>1` a.`R-{0}` b. `R-{1}` c. `-{-1}` d. `R-{-1,1}`

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