$\frac{x^3+x^2-12}{x-2}$
$\sin^2x\sec x-\sec x=-\cos x$
$15xy\:-3x^2\:-\:4y^2\:-\:3x^2\:-\:4y^2$
$\frac{d^3}{dx^3}\left(3x+5\right)^8$
$\frac{15}{\cos\left(30\right)}$
$\frac{dz}{dt}=0.005\left(20-z\right)^{2}$
$\int\frac{7x-13}{2x^2-8x+6}dx$
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