$\frac{dy}{dx}\left(ln\left(x^2+y^2\right)\right)$
$\left(2+3x+x^2\right)\left(2+x\right)$
$x^2+10x=-50$
$\left(3x^4\:-\:5x^3\:+\:7x^2\:-\:2x\:+\:13\right)\::\:\left(x\:-\:4\right)$
$-2m^2-4m^3+6m^4-3-\left(4m^2+2m^3+3m^4\right)$
$\frac{12g^2}{25}.\:\frac{40}{9g^4}$
$-3x-8x-5x-10x$
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