$\lim\:_{x\to\:-9}\left(2x-1\right)\left(\sqrt{1-2x}\right)$
$9x^4+42x^2+49$
$cotx\left(2sinx+1\right)=0$
$y-3\le6$
$\int\frac{4}{\sqrt{1-4x^2}}dx$
$81z^2-180z+100$
$-12x-28-24x$
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