$\frac{d^2y}{d^2x}\left(x^2\:+\:xy\:+\:y^2\:=\:6\right)$

$4x^2-49z^2$

$\lim_{x\to-9}\left(\frac{x+3}{\left|x+3\right|}\right)$

$23nm+13nm$

$\int_5^{\infty}\left(\frac{\log\left(9x\right)^8}{x}\right)dx$

$\left(\frac{3ab^2}{2}-\frac{8ab}{3}\right)^2$

$\left(cos\left(3\pi\right)sin\left(3\pi\right)\right)$