$\lim_{x\to0}\left(\frac{x^2-\sin^2\left(x\right)}{x^2\sin\left(x\right)}\right)$

$\int\frac{5}{2x^2+1}dx$

$4y^2-9x^2-36z=0$

$\frac{a^2}{b^2}+\frac{b^2}{a^2}+9$

$\left(2x+4\right)+\left(2x+4\right)$

$\int\left(\cosh\left(4x+11\right)\right)dx$

$\int 9 \pi z ^ { 8 } d z$