$\int_{\frac{-\pi}{4}}^{\frac{\pi}{4}}sen8xsen8xdx$

$\int\left(\cos\left(5bx\right)\right)dx$

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

$36-25b^2$

$y^{\left(\frac{1}{2}\right)}y'+y^{\left(\frac{3}{2}\right)}=1$

$3y-y+1y$

$\sec\left(x\right)^2-4\tan\left(x\right)=6$