$a^2+4^2$
$\int\left(8x^2+1\right)^2dx$
$\frac{dx}{dy}+2x=3$
$w^2-1$
$\lim_{x\to2}\left(\frac{1}{2+x-x^2}-\frac{2}{16-x^4}\right)$
$\int_1^{\infty}\left(\frac{x}{\sqrt{1+x^2}}\right)dx$
$\lim_{x\to2}\left(\frac{\sqrt{x+2}-2}{\sqrt[3]{x+6}-2}\right)$
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