$\int\left(4^x\:.\:5x\right)dx$
$\lim_{x\to-\infty}\left(t^{-2}xe^{\frac{-x}{t}}\right)$
$9+9\cos x=6\sin^2x$
$\log\left(3x+4\right)=1$
$r+15=4r-6$
$\frac{dy}{dx}=\frac{y+2}{x-4}$
$\frac{n\:dn}{n}=te^{t+2}dt$
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