$25x^4+139x^2y^2+81^4$
$x^2-10x=2$
$\lim_{x\to\infty}\left(\frac{\left(\arctan\left(x\right)\right)}{\left(e^{-x}\right)}\right)$
$\frac{dy}{dx}\left(y=x^{10}\right)$
$5x+2+6x-8-x+3+9x$
$\frac{dy}{dx}=\frac{x-xy}{xy-y}$
$x^2=3x+4$
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