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If int f(x)dx=f(x), then int {f(x)}^(2)d...

If `int f(x)dx=f(x)`, then `int {f(x)}^(2)dx` is equal to

A

`(x{f(x)}^(2))/(2)-({f(x)}^(2))/(4)+C`

B

`x^(2)({f(x)}^(2))/(2)-({f(x)}^(4))/(4)+C`

C

`xf(x)-({f(x)}^(2))/(4)+C`

D

`xf(x)+C`

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