$-9m^2-2m^2$
$f\left(x\right)=\left(5x^4+3x^2-4\right)^3$
$8x^4-30x^3-267x^2+520x+525$
$a^2b+a^6b^2-a^4b^4$
$2\sec\left(x\right)=-\sec^2\left(x\right)$
$\int\frac{x^2-x}{x\left(x+1\right)}dx$
$16x^2-\:\:\:16xy\:+\:4y$
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