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f(x) = 1 + [cosx]x in 0 leq x leq pi/2 ...

`f(x) = 1 + [cosx]x` in `0 leq x leq pi/2` (where [.] denotes greatest integer function)

A

It is continuous in `0ltxltpi//2`

B

It is differentiable in `0ltxltpi//2`

C

Its maximum value is 2

D

Its not differentiable in `0ltxltpi//2`

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