$\left(-318\right)+\left(-146\right)+\left(189\right)$
$-71a-84b+50a+84b-45a+18a$
$\frac{1}{y^2-4}\cdot dy=\frac{2}{x^2-1}\cdot dx$
$2\left(x+3\right)=10$
$x^6-2x^3y^2+y^4$
$\frac{x^2-13x+39}{x-6}$
$\frac{1}{cscx-cotx}+\:\frac{1}{cscx+cotx}$
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