$log20\:\left(x\:+\:2\right)\:+\:log20\:\left(x\:-\:6\right)\:=\:1\:\:$
$1+\cot^2\cdot10$
$\frac{d}{dx}\frac{e^x}{x^2}$
$\frac{\cos^2\left(x\right)-\cos^4\left(x\right)}{\tan\left(x\right)}$
$\int\frac{x+4}{x^2+2x+13}dx$
$\left(x^2-1\right)\:\left(2x\right)$
$\lim_{x\to3}\left(\frac{4x^2-36}{x^2+9}\right)$
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