$\frac{3^{n+3}-3^{n+1}}{3\left(3^{n-1}\right)}$
$\frac{dy}{dt}=\frac{t^3+2y}{t}$
$\left(sinx\right)\left(cosx\:-sinx\right)$
$2500x+754y=900$
$\sin x\cos x=-1$
$\left(3x-2\right)\left(x-1\right)$
$\lim_{x\to-6}\left(\frac{x^2-13x+42}{x-6}\right)$
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