Let f(x) = |x| x , for all x ∈ R. Discuss the derivability of f(x) at x = 0, Differentiable, Not differentiable, Differentiable for positive real numbers, Differentiable for negative real numbers, If y = tan(x + y) ,find y', – cosec^2(x+y), -cosex(x+y), Tan(x+y), None

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