$\lim_{x\to\frac{\pi}{4}}\left(\frac{tan\left(x\right)}{cos\left(x-\frac{\pi}{4}\right)}\right)^{\frac{1}{sen\left(x-\frac{\pi}{4}\right)}}$

$\frac{\cos\left(a\right)}{\cos\left(a\right)}=\sin\left(a\right)$

$4+7+2-7-3$

$\left(x-2\right)\frac{dy}{dx}+y=x^2-4$

$2bc^6\:+\:16bg^9$

$\left(z-3q\right)\left(10\right)$

$x^2-5x+3\le3$