$\frac{dy}{dx}=\frac{\sqrt{1+x^2}}{x\cdot y^2}$
$\lim_{x\to\infty}\left(\frac{\pi}{3}\right)^x$
$\sqrt{15n^{2}}\cdot\sqrt{10a^{3}}$
$5x-13>7$
$16-40b+25b$
$\frac{1}{x^2}+\frac{1}{x^2+x}$
$\left(3x^2+2x-8\right)+\left(x+2\right)$
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