$\left(9-a\right)y\left(9+a\right)$

$\frac{1}{\cos\left(x\right)}-\sin\left(x\right)=\sec\left(x\right)-\frac{1}{\csc\left(x\right)}$

$\frac{2x^3-23x^2+58x+35}{x+2}$

$x^2\:+2+\:64\:\:$

$\lim_{n\to\infty}\sqrt[3]{n}-\sqrt[3]{n-1}$

$\int\left(7^{2x}\right)dx$

$2x-4y+7=0$