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[int e^(x)((f(x)-f'(x))dx=phi(x)" then "...

[int e^(x)((f(x)-f'(x))dx=phi(x)" then "],[int e^(x)f(x)dx" is "],[" (a) "phi(x)+e^(x)f(x)],[" (b) "phi(x)-e^(x)f(x)],[" (c) "(1)/(2){phi(x)+e^(x)f(x)}],[" (d) "(1)/(2){phi(x)+e^(x)*f'(x)}]

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