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IF int f(x) cos x dx =1/2 (f(x))^2+C ...

IF ` int f(x) cos x dx =1/2 (f(x))^2+C and f(0) =0` then ` f'(0) =`

A

1

B

`-1`

C

`0`

D

`2`

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The correct Answer is:
A
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