$\left(7x^2+2b^2\right)\left(7x^2-2b^2\right)$
$5\left(x-4\right)+\left(x+4\right)\left(x-4\right)-\left(x-4\right)^2$
$\frac{x^3+x}{x-2}$
$x\sqrt{x^2}-1$
$10-\left(-8-\left(15-13\right)\right)$
$\int9y^2\sqrt{1-9y^3}dy$
$e^4=x$
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