$e^3=y$
$2y^2-4yx+3y-6x$
$\frac{sec}{sec-tan\:}$
$-\cot b+\cos b=0$
$\lim_{x\to5}\left(\frac{\sqrt{x}-\sqrt{5}}{x^2-25}\right)$
$\left|1-x^2\right|\le\left(1+x\right)^2$
$\frac{dy}{dx}\left(y=x^{6x+7}\right)$
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