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L e tf(x)={x+2 , x <-1 ; x^2 , -1...

`L e tf(x)={x+2 , x <-1 ; x^2 , -1 lt= x < 1 and (x-2)^2 , x geq 1` Then number of times `f^(prime)(x)` changes its sign in `(-oo,oo)` is___

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