$\frac{\sec^2x-\sin^2x}{\tan^2x}$
$\frac{dy}{dx}=3x+2$
$\frac{d}{dx}\left(\frac{\ln\left(1+x\right)}{\ln\left(2\right)}\right)$
$b^3+b^3+b^3+b$
$\lim_{x\to8}\left(\frac{7+x}{8-x}\right)$
$7x+7x^6+9x^7$
$y2=38$
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