$\cos^{2}x-\frac{1}{2}=\sen^{2}x-\frac{1}{3}$
$\left(x-30<10\right)$
$\sqrt{\sin\left(\pi\right)\cos\left(\pi\right)}$
$\lim_{x\to-2}\left(\frac{x^3-8}{x^2-4}\right)$
$\lim_{x\to0}\left(\frac{2\sin\:\:\:^2\left(x\right)\csc\:\:\:\left(2x\right)}{x}\right)$
$\frac{d^2}{dx^2}\left(\ln\cos\left(x\right)\right)$
$\log\left(x-3\right)=\log\left(17-4x\right)$
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