1.

The area bounded by the curves \[y=f(x),\] the x-axis, and the ordinates \[x=1\]and \[x=b\] is \[(b-1)\sin (3b+4)\]. Then \[f(x)\] is

A. \[(x-1)\cos (3x+4)\]
B. \[sin(3x+4)\]
C. \[\sin (3x+4)+3(x-1)\cos (3x+4)\]
D. None of these
Answer» D. None of these


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