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If d/dx(f(x))=f'(x), then int(x.f\'(x)-2...

If `d/dx(f(x))=f'(x)`, then `int(x.f\'(x)-2f(x))/sqrt(x^4.f(x))dx` (A) `x^2f(x)+c` (B) `|x|f(x)+c` (C) `2f(x)/|x|+c` (D) `2sqrt(f(x))/|x|+c`

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