$\lim_{x\to0}\left(\frac{\sqrt{1+x}-\frac{x^2}{2}-1}{x^2}\right)$
$\int\:\frac{1}{\left(x^2+1\right)^{\frac{3}{2}}}dx$
$120+85+45$
$\frac{5x^2-2x}{3x}$
$9=-y$
$\frac{dx}{dy}=x\left(1+xy^2\right)$
$\int5\left(5x+10\right)^9dx$
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