ap-calculus-bc 2012 Q24

ap-calculus-bc · Usa · practice-exam Integration by Parts Multiple-Choice Primitive Identification
Let $f$ be a differentiable function such that $\int f ( x ) \sin x \, d x = - f ( x ) \cos x + \int 4 x ^ { 3 } \cos x \, d x$. Which of the following could be $f ( x )$ ?
(A) $\cos x$
(B) $\sin x$
(C) $4 x ^ { 3 }$
(D) $- x ^ { 4 }$
(E) $x ^ { 4 }$
Let $f$ be a differentiable function such that $\int f ( x ) \sin x \, d x = - f ( x ) \cos x + \int 4 x ^ { 3 } \cos x \, d x$. Which of the following could be $f ( x )$ ?

(A) $\cos x$

(B) $\sin x$

(C) $4 x ^ { 3 }$

(D) $- x ^ { 4 }$

(E) $x ^ { 4 }$