$\frac{9-n^4}{3+n^2}$
$2y=6-x$
$\left(1000x^4+625^2+144\right)$
$\left(2-3x^2+x^4\right)\left(x^2-2x+3\right)$
$6x^3-7x$
$\arcsin\left(\sin\left(-\frac{5\pi}{4}\right)\right)$
$3x^2-18x-12=0$
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