$\frac{8cos\left(\theta\:\right)cot\left(\theta\:\right)}{1-sin\left(\theta\:\right)}-8=8csc\left(\theta\:\right)$
$\frac{z^2+z+3}{z^3+2z^3+z+5}$
$3\left(x^2+y^2\right)-2\left(x^3+\:y^3\right)$
$\lim_{x\to-6}\left(\frac{x^2+8x+12}{x+6}\right)$
$\lim_{x\to0}\left(\frac{2cosx\:-+x^2}{x^2\sin x}\right)$
$\frac{dy}{dx}=\frac{5x^2}{3y}$
$4x-3y=1$
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