$9\cdot2\:12\cdot4$
$\left(2x-5\right)^2$
$-cos\left(\frac{\pi}{3}-x\right)-sen\left(x\right)$
$\lim_{x\to\infty}\left(\ln\left(\left(1+\frac{1}{x}\right)^x\right)\right)$
$4a^2-\:9b^2\:c^2$
$1\:-6\:25$
$\frac{csc\left(\theta\:\right)-1}{cot\left(\theta\:\right)}=\frac{cot\left(\theta\:\right)}{csc\left(\theta\:\right)+1}$
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