$5tan^2\theta\:=\frac{23}{cos\theta\:}+5$

$\left(x+2\right)\left(5x-4\right)+\left(2x+3\right)\left(x+2\right)$

$\lim_{x\to0}\left(\frac{\:e^x}{x^2}\right)$

$y=\:\cot\left(x\right)\tan\left(x\right)$

$-3.4+5.6+7.2$

$\left(12x-19y-3\right)-\left(7x+15y+8\right)$

$\int\left(x+5\right)^{10}dx$