$\frac{d}{dx}\left(\sqrt{\frac{e^{senx}+1}{e^{senx}-1}}\right)$
$\frac{\tan a-1}{\sec a}$
$\frac{d}{dx}\left(6x^2y+9y^2x=-3\right)$
$x^2-3x+38<0$
$\frac{3x^2+2x-4}{x^3-8}$
$7a^2-5a^2-3a^2$
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