$-\frac{\csc\:\left(x\right)}{\sec\:^2\left(x\right)}$
$\frac{x^2-2x+2}{x+1}$
$\frac{-2x-y}{x+2y}$
$\left(-\frac{y}{\sqrt{49-y^2}}\right)^2$
$\frac{-10y^4}{5y^3}$
$\left(x\right)\left(x-4\right)$
$10-\left(-5-6\right)+10-\left(10+1\right)$
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