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If f(x) = sin[pi^(2)]x + cos [-pi^(2)]x ...

If `f(x) = sin[pi^(2)]x + cos [-pi^(2)]x` then `f'(x)` is here `[pi^(2)]` and `[-pi^(2)]` greatest integer function not greater than its value

A

`-1`

B

`sin9x + cos 9x`

C

`9 cos 9 x - 10 sin 10 x `

D

0

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The correct Answer is:
C
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