$\tan\left(x\right)=\tan^2\left(x\right)$

$\lim_{b\to a}\left(\frac{-e^{-\frac{w}{a}}+e^{-\frac{w}{b}}}{b-a}\right)$

$8.9x+6.2+8.7$

$\frac{1}{2}x-4\le\:-9-\frac{1}{3}x$

$\int\left(\tan\left(y\right)+\sec\left(y\right)\right)^2dy$

$y^2+4y+3$