$\frac{\cos\left(2a\right)}{\sin\left(a\right)}+\frac{\sin\left(2a\right)}{\cos\left(a\right)}$

$\sec\left(x\right)\tan\left(x\right)-3\sec\left(x\right)=0$

$12x^2+8x$

$\sqrt{8}+\sqrt{8}$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\tan\left(x\right)}{\tan\left(4x\right)}\right)$

$\left(a-\frac{1}{2}y\right)^2$

$\int\frac{5x+2}{x^2+4x+4}dx$