$\frac{1^{-13}}{1^{-6}}$
$\log\left(x^2-1\right)-\log\left(x+1\right)$
$c^4+3c^2-4\cdot2c^2-2c+6$
$2\sin\left(x\right)\cdot\cos\left(x\right)=2\cos\left(x\right)$
$a+\frac{1}{a}=5$
$8\left(r-2\right)+3r=61$
$\lim_{x\to3}\left(\frac{x^2-2x-3}{x^2-4x+3}\right)$
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