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Let f(x+y) = f(x) + f(y) - 2xy - 1 for a...

Let `f(x+y) = f(x) + f(y) - 2xy - 1` for all x and y. If f'(0) exists and `f'(0) = - sin alpha`, then `f{f'(0)}` is

A

-1

B

0

C

1

D

2

Text Solution

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The correct Answer is:
C
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