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Question 1
If $\int e^{x}(f(x)-f'(x))dx=\phi(x)$ , then the value of $\int e^x f(x) dx$ is
A.
$$\phi(x)+e^xf(x)$$
B.
$$\phi(x)-e^xf(x)$$
C.
$$\frac{1}{2}[e^xf(x)+\phi(x)]$$
D.
$$\frac{1}{2}[e^xf'(x)+\phi(x)]$$
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