$\frac{9}{tan^2\:x\:+\:1}$
$\left(3x^4+5x^3\right)\left(-8x^4+5x^3\right)$
$.125\int_{-2}^xdt$
$6x^3+13x^2-13x-20$
$8-x+5x$
$3x^2-9x-5y-2=0$
$5y<2$
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