$\lim_{r\to1}\frac{a\left(r^n-1\right)}{r-1}$
$2.5+11.5$
$\left(\:t+28\right)\:\left(\:t-28\right)\:$
$\lim_{x\to0}\left(\frac{e^{3x}-1}{e^x}\right)$
$2\sin\left(x\right)^2-1+4\sin\left(x\right)^2\cos\left(x\right)^2$
$\frac{dy^2}{dx}=9xy$
$\int\frac{ln1-t}{t}dt$
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