If the area bounded by the curve y=f(x),...

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

`(x-1)cos (3x +4)`

`8 sin (3x +4)`

`sin(3x+4)+3(x-1)cos (3x +4)`

None of these

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