$cot\left(x\right)+csc\left(x\right)=2cot\left(x\right)$
$10x^2-2x-4$
$4a+3b-7a+7ab-5b$
$\frac{x^2+x+1}{x+1}$
$\frac{3x^2y^3-5a^2x^4+20xa^2}{-3x^2}$
$y=y'\left(x+y^2e^y\right)$
$-9\:\left(8\:+\:3w\right)$
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