$-300+2\cdot180$
$\frac{dy}{dx}y=csc\left(x\right)\cdot tan\left(x\right)$
$x^4+13x^2+42$
$9x^4+6x^6+3x^8$
$7ab-11ab+20ab-31ab$
$\left|8+6\right|$
$\frac{x^{2}+5x^{3}-19x+7}{2}\leq3x+5$
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