$\frac{1-\cos\left(8x\right)}{8}=b$
$\frac{x+5}{-3}=3x-5$
$-5a+2x-4x$
$sec^2\left(\theta\:\right)+tan^2\left(\theta\:\right)cos^2\left(\theta\:\right)+cos^2\left(\theta\:\right)$
$-100+2\left(-7\right)+4\left(-1\right)$
$\lim_{x\to0}\left(\frac{xe^x}{e^x-1}\right)$
$cos\left(a-b\right)-cos\left(a+b\right)$
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