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Let the function f, g, h are defined fro...

Let the function `f, g, h` are defined from the set of real numbers `RR` to `RR` such that `f(x) = x^2-1, g(x) = sqrt(x^2+1), h(x) = {(0, if x lt 0), (x, if x gt= 0):}.` Then `h o (f o g)(x)` is defined by

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