$\int\tan\left(-2x+4\right)dx$
$\frac{1}{e^{-5y}}dy=\frac{-1}{-x^2+x}dx$
$\frac{d}{dx}\frac{x+y}{x-y}=3x$
$3xy-6x+2y-4$
$-2fu5fu2fu$
$3x+2x-x+2x^2$
$\sqrt{81-9x^2}$
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