$\cot^2x\sec^2x-1=1$
$2\:-\left(-3\right)\:+\:6$
$5\cdot\sqrt{64}-8\cdot\sqrt{25}$
$3x-11+-x-7$
$\frac{-x+3x+7}{\left(x+2\right)^2\left(x^2+x+1\right)}$
$6ax^2y^2-2a^3xy-2x^4y-2xy^4$
$\frac{x^2+3x-18}{x+3}$
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