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Let [x] denotes the greatest integer les...

Let [x] denotes the greatest integer less than or equal to x and f(x)=`[tan^(2)x]`.Then

A

`underset(x to 0)f(x)` does not exist

B

f(x) is continuous at x=0

C

f(x) is not continuous at x=0

D

f'(0)=1

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