Question: 20) a) Is the function f(x) 1 differentiable on the open interval (-1,1)? x2+1 b) Is the function f(x) 2X x2.9 differentiable on the open

20) a) Is the function f(x) 1 differentiable on the open interval (-1,1)? x2+1 b) Is the function f(x) 2X x2.9 differentiable on the open interval (-4, 4)

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