$\frac{d}{dx}\left(25csc\left(t\right)\right)$
$\lim_{x\to a}\left(\frac{\left(x^2-\left(a+1\right)+a\right)}{\left(x^2-a^2\right)}\right)$
$\lim_{x\to9}\frac{4x}{\sqrt{x+7}}$
$5x^2-2x-1=0$
$8a^5-12a^2$
$-5\left(6x\:+\:5\right)\:=\:125$
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