$2x^2-30x+180$
$cos\:\left(\theta\:\:+\:\frac{\pi\:}{2}\right)=\:sin\:\theta\:$
$2x-8\le5x+3$
$8sinx\:+20=24$
$\frac{1}{x-2}+\frac{1}{x+4}=\frac{8}{7}$
$105=x+2x$
$\frac{4r^2}{7r^3}$
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