$\frac{dy}{dt}=-y$
$12-36-8+15-19-20-36+2-1$
$\left(5a\:+2b\right)^2$
$1+\cos x+\cos2x=0$
$\lim_{x\to-3.1}\frac{\tan\left(x+3\right)}{x+3}$
$\left(x+3\right)^{2}=4$
$\frac{dy}{dx}=8x^3+12x+3$
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