$\frac{csc\left(-31.5\right)^2-1}{csc\left(-31.5\right)}$
$\frac{\left(7\times35\right)-\left(-4\right)}{0}$
$y'\:=\:2xy\:+\:x$
$8cos^2x+16cosx+8$
$\left(7+7n\right)\left(7-7n\right)$
$49x^2-36x^2$
$-282-2842$
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