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Q)

For a real number y, let [y] denotes the greatest integer less than or equal to y. Then the function f(x)=tan(π[xπ])1+[x]2 is

(a)discontinuous at some x(b)continuous at all x,but the derivative f'(x) does not exist for some x(c)f'(x) exists for all x,but the second derivative f'(x) does not exist for some x(d)f'(x) exists for all x

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