$tanxcoty-1$
$\frac{2\cos\:\left(x\right)\sin\:\left(x\right)}{\cos\:^2\left(x\right)}$
$\frac{dy}{dx}\left(\frac{y}{x-y}=\:2+x^2\right)$
$\sin\left(2a\right)=-2\cos^2\left(a\right)$
$\log\:\left(\frac{\sqrt{y}}{x^4\sqrt[3]{z}}\right)$
$x2+\:3\:>\:5x\:-1$
$\left(a+\frac{1}{2}\right)\left(a+1\right)$
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