$\lim_{x\to2}\left(\frac{x^2-4}{2x+4}\right)$

$\frac{d}{dx}\left(2y^2-xy+x^2=16\right)$

$y=e^{5x+\ln\left(x\right)}$

$\left(18x^4-23x^2+35\right)+\left(-25x^4+12x^2-16\right)$

$21x^3y^3+7x^2y^3+14xy^6$

$\lim_{x\to\infty}\left(\frac{\ln x^2}{\sqrt{2x}}\right)$

$y'-2y=2x$