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[" 20Let "int e^(x){f(x)-f'(x)}dx=phi(x)...

[" 20Let "int e^(x){f(x)-f'(x)}dx=phi(x)" ,then "int e^(x)f(x)dx" is equal to "],[[" 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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