$\cos^2\left(x\right)-\sin^2\left(x\right)=\frac{1}{2}$
$17+12+-1$
$3\log\left(x-1\right)-2\log\left(x^2-1\right)$
$30:\left(-10\right)$
$18 + 9 p + 0$
$\lim_{x\to-\infty}\:\left(1\right)$
$50a^5b^4c^335a^2b^3c^5$
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