$\left(3x^{2x}+8^y\right)\left(3x^{2x}-8^y\right)$
$6f-5f$
$\frac{5x-12}{\left(x^2-4x\right)}$
$8x^2-12xy+6xy-9y^2$
$\frac{dy}{dx}\left(e^xcos\left(y\right)=x+y\right)$
$x^8+18x^4+81$
$\left(625^4x\:2^4\right)\::\:25^4$
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