$y^'+\left(\arctan\left(x\right)\right)y=0$

$\left(1-\left(.75\right)xy\right)^2$

$\log_{2x}\left(16x+9\right)=2$

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

$\int\sqrt{1-64x}dx$

$\int_0^{\frac{\pi}{24}}\left(\frac{sen^2x}{\left(1+\tan^2\left(x\right)\right)}\right)dx$

$\left(2x-y\right)^2-\left(5x-2y\right)^2$