$\lim_{x\to0}\frac{x-1}{\sqrt{x^2+3}-2}$
$\int\sqrt{5-2x-x^2}dx$
$4\log\left(x\right)-2\log\left(y\right)=\log\left(9\right)$
$\left(1+x\right)y'=2y$
$\left(5x^3y^2+x^2\right)$
$\left(\frac{2+x}{1-4x}\right)^{-\frac{1}{2}}$
$15-\frac{1}{2}\cdot2$
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