$c=\sin x\cdot\cot x+\cos x$
$\:-6\:-\:7\left(\:-11\:-\:5s\right)$
$5+3-6-8+4-\left(-7\right)$
$\ln12=\ln\left(n+5\right)$
$x^4.x^5$
$\lim_{x\to1}\left(\frac{1-x+\ln\left(x\right)}{1+\cos\left(7\pi\right)}\right)$
$\lim\:_{x\to\:\:3}\left(\frac{5x^2-8x-13}{x^2-5}\right)$
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