$4\log\left(36-x^2\right)-\left(\log\left(x-6\right)+\log\left(x+6\right)\right)$

$+8-30-6-50$

$\left(x+y\right)\left(a+b-1\right)$

$5-6-2-\left(1-8\right)-3+6+5$

$cos\:x\:=\:0.77$

$\lim_{x\to\infty}\left(x-\left(x^2-4x+3\right)^{\frac{1}{2}}\right)$

$\int\frac{6}{\left(x^{-6}e^{2x}\right)}\:dx$