$\int_0^1\left(3-x\right)e^{-x}dx$

$\left(-x-9\right)^2$

$6.25l^2+5l+1$

$\log\left(4x\right)+\left(\frac{5}{\log\left(x\right)}\right)-9$

$\tan\left(a\right)^4+\tan\left(a\right)^2=\sec\left(a\right)^4-\sec\left(a\right)^2$

$\int_3^9\left(\pi\left(\frac{1}{x^3}+3\right)^2\right)dx$

$\frac{1}{x\:+\:2}\:+\:\frac{3}{x\:-\:2}$