$\lim_{x\to\frac{\pi}{2}}\left(cos\left(x\right)\ln\left(sen\left(2x\right)\right)\right)$

$\int5xe^{8x}dx$

$\left(3\right)^2-2\left(3\right)+1$

$12z^2\:-\:16z\:+\:4$

$4m^2-16n^2$

$\lim_{x\to\infty}\left(\frac{\ln\left(\sin\left(3\cdot x\right)\right)}{\ln\left(\sin\left(x\right)\right)}\right)$

$4n^{2-1=0}$