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The area bounded by the curve y=f(x), X-...

The area bounded by the curve `y=f(x)`, X-axis and ordinates x=1 and x=b is `(b-1) sin (3b+4)`, find `f(x)`.

A

` (x – 1) cos (3x + 4) `

B

sin (3x + 4)

C

sin (3x + 4) + 3(x – 1). cos (3x + 4)

D

none

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The correct Answer is:
C
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