$8x^4-2x^2$
$9m^2n^2+42mn+4n$
$-9a^2-12ab-b^2$
$cot^2\:135\:+\:tan^4\:60\:-\:sin^4\:180$
$1+\sin\left(x\right)=\frac{3}{2}$
$\frac{x^4+2}{x^2+6x+4}$
$xy+y^2y'=6x$
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