If f(x)=(ax + b)sinx+(cx +d)cos x, then ...

If `f(x)=(ax + b)sinx+(cx +d)cos x`, then the values of a b, c and d such that `f"(x)=xcos x` for all x, then (a + b + c + d)is

A

`a=d=1,b=c=0`

B

`a=c=1,b=d=0`

C

`a=b=1,c=d=0`

D

`a=b=1,c=d=1`

Text Solution

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The correct Answer is:

A

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