$\:csc\left(a\right)=\frac{\sqrt{7}}{2}$
$\frac{dy}{dx}=\frac{\left(1-2xy\right)}{x^2}$
$\left(b+8c\right)\left(b-8c\right)$
$2a+3=a+5$
$\left(y^4-1\right)$
$1^2-2$
$64-3|3-7\left(9-2\right)|$
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