$\lim_{x\to1}e^{2-x}$

$\log\left(x\right)=\log\left(x-4\right)+\log\left(5\right)$

$\lim_{x\to\infty}\left(1+\frac{3.6}{x}\right)^{1.5x}$

$\int3\left(x+3\right)e^{\left(x^2+6x+4\right)}dx$

$2\left(1-\cos^2\left(x\right)\right)+cos^2x=1+sen^2x$

$\frac{x^2-1}{x^5-1}$

$\int\left(1+4x\right)^{\frac{-1}{2}}dx$