$cot\left(y\right)=cot\left(\frac{1}{x}\right)$
$9x^2+49x+36$
$-6\cdot12+5$
$2\left(\log\left(x+2\right)+2.5\left(\log\left(x+5\right)\right)\right)$
$1-2sin^2\:y=1-2cos^2\:y$
$\int x^5\cdot x^4\sqrt{6-3x^5}dx$
$\cos^2x\cot^2x+\cos^2x=\cot^2x$
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