$\sqrt{\csc\left(^2\right)-1}$
$841u^{12}-169v^2$
$-\frac{1}{4}x^2+2.-\frac{1}{4}.-y-y^2$
$y^2-8y+15$
$-2y=x^2e^2$
$\left(4\right)\left(-5\right)\left(0\right)\left(-3\right)$
$\lim_{x\to\:13}\left(\frac{x^2-13}{x^2-169}\right)$
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