$\lim_{x\to0}\left(\left(\frac{18x}{18x-7}\right)^{5x}\right)$
$\sqrt{4x^{-2}}y^{\frac{1}{2}}$
$2x^2+x-400=0$
$2\left(\frac{dy}{dx}\right)+10y=1$
$\left(5x^3+4y^3\right)^2$
$7y^{3\:}+6y^2$
$1-a+8+-a+6$
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