$f\left(x\right)=\frac{x-1}{x^2-1}$
$4z+3z+9z$
$\frac{e^2}{e^{2x}}$
$-\left(-6\right)\:\left(-1\right)$
$\left(x^4-x^3+2x^2-4x-8\right)\left(x^4+x^3-x^2-x-2\right)$
$xy'\:+\:y^2\:=\:y^3$
$2^3\cdot3^3+2^2$
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