Continuity and DifferentiabilityHard

Question

If f (x) = cos π( | x | + [x]), then f (x) is/are (where [.] denotes greatest integer function)

Options

A.continuous at x = 1/2
B.continuous at x = 0
C.differentiable in (2, 4)
D.differentiable in (0, 1)

Solution

-1-

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