$\frac{1}{2}x-2\le4-\left(2x+4\right)$

$\:7xy\:restar\:-8xy$

$\frac{csc\left(t\right)-sin\left(t\right)}{cot\left(t\right)}$

$\frac{2-\sec\left(x\right)^2}{\sec\left(x\right)^2+2\tan\left(x\right)}$

$\lim_{x\to2}\left(\frac{x^2-4}{ln\left(x-2\right)}\right)$

$5d-6^2$

$x^2y''\left(x\right)\:+\:2xy'\left(x\right)\:-\:2y\left(x\right)\:=\:6x$