$\frac{dy}{dx}\sec\left(xy\right)$
$y'''+3y''+2y'=0$
$z=1+i$
$\frac{dx}{dt}=tx+t+x+1$
$12x^3-5x^2-3x+x-3x^2-x^3+2x-11x^3-x^2$
$\lim_{x\to0}\left(1+\frac{1}{e^x}\right)^x$
$255+-55+-10+15+10$
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