1.

A function f: R rarr R satisfies sin x cosy (f(2x2y))-f(2x-2y))= cosxsiny(f(2x+2y))+f(2x-2y))If f'(0)=1/2 , then

Answer»

`F''(x) = f(x) =0`
`4F''(x) = f(x) =0`
`f''(x) + f(x) =0`
`4f''(x) -f(x)=0`

ANSWER :B


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