Let f(x) = { x^(2) -  x if x is smaller than or equal to 0,  x[sin(pi+x)] if 0 < x} where [y] = greatest integer less than or equal to y. a) Is f continuous at 0? b) Is f differentiable at 0?

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Let f(x) = { x^(2) -  x if x is smaller than or equal to 0,  x[sin(pi+x)] if 0 < x} where [y] = greatest integer less than or equal to y.

a) Is f continuous at 0?

b) Is f differentiable at 0?

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