$\frac{1}{2}\ln x-\ln\left(x-2\right)=0$
$8xy\:-\:25y\:+\:45x\:2\:-\:17x\:2\:-\:13y\:+\:14xy$
$2\sqrt{343}$
$4\sqrt[2]{20x^4}y^5$
$x\left(\tan\left(47\right)-\tan\left(17\right)\right)=389\:\tan\left(17\right)$
$\int9\left(9x+4\right)dx$
$\lim_{n\to\infty}\:\frac{1}{2^n+3}$
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