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Is this integral possible:

$\int\left(f(a \cdot b,x)g(c \cdot d,x)\right)dx= h(a \cdot c,x)j(b \cdot d,x)$

with $(a \cdot b\neq a \cdot c)$ and $(c \cdot d \neq b \cdot d)$ and $f \neq g \neq h \neq j$?

If this is possible, what are the functions $f$, $g$, $h$, and $j$?

PLEASE READ

I'm trying to find nontrivial instances of these functions such that they all include $x$, and that $(a\cdot b)$ isn't multiplied by $c \cdot d$ in the integral, and that $a \cdot c$ isn't multiplied by $b \cdot d$ in the result.

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    Sorry, I forgot to add a restriction on the functions to ensure they're not trivially equal.2012-12-07

1 Answers 1

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Assuming $b\neq 0$, take $f(ab,x)=\frac{ac}{b}x$, $g(cd,x)=(c+d)x$, $h(ac,x)=(ac^2+acd)x$ and $j(bd,x)=\frac{1}{b^2}\frac{x^2}{3}$. Obviously, \begin{equation}\int f(ab,x)g(cd,x)\, dx=h(ac,x)j(bd,x) \end{equation} Is this what you are asking?

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    How is $acx/b$ a function of $x$ and $ab$?2012-12-07