$\lim_{x\to+\infty}\left[\frac{1+\tan\left(x\right)}{1+sen\left(x\right)}\right]^{\frac{1}{sen\left(x\right)}}$

$\lim_{x\to\infty}\left(\frac{x-x^2}{1-x^2}\right)$

$\int\left(1+4x\right)^6\left(4\right)dx$

$\frac{y}{y^5}^5$

$\frac{5}{2}x+8;x=1$

$16x^2-40+25$

$108^2-92^2$