$\left(sec\left(x\right)\left(cos\left(x\right)\right)+tan\left(x\right)sin\left(x\right)\right)=sec^2\left(x\right)$

$\left(1+x^2\right)y'\:+\:2xy\:=\:2x$

$\lim_{x\to0}3xe^{2x}$

$x-\left(y-z\right)$

$\frac{2x^2+10x+18}{x+3}$

$\lim_{x\to1}\left(\frac{sin\left(1-x^2\right)}{x-1}\right)$

$27.35-96.77+67.41-65.63+13.73-54.62$