$x^2+6x+12=0$

$\lim_{x\to3}\left(7x-2\right)\cdot\left(-2x^2+5\right)$

$\frac{2}{\sqrt{1+\frac{1}{2}}}\arctan\left(\sqrt{\frac{1-\frac{1}{2}}{1+\frac{1}{2}}}\tan\left(\frac{x}{2}\right)\right)$

$\frac{x^3-4x^2}{x^2-16}\:$

$\left(x^2+1\right)dx+\frac{1}{y}dy=0$

$-7+46-107-19$

$\left(2a^2+b^2\right)^2$