$\lim_{x\to0}\left(\frac{8x^2}{cos\left(x-1\right)}\right)$

$\int x^2\cdot cos\left(nx\right)dx$

$-\frac{385}{-55}$

$\int5\left(2+3\tan x\right)^4\sec^2\left(x\right)dx$

$\left(8a+5\right)\left(8m-5\right)$

$\lim_{x\to\infty}\left(\frac{\tan\left(\frac{1}{x}\right)^2}{\ln\left(1+\frac{4}{x}\right)^2}\right)$

$\left(1+\tan\left(8\right)^2\right)$