$\int\frac{x^7}{\left(8-x^8\right)^2}dx$
$\lim_{x\to1}\left(\frac{\sqrt{x-1}}{x+1}\right)$
$16x^2+32x^2+16y^2$
$\lim_{x\to5}\left(\frac{x-5}{x^2-10x+25}\right)$
$1+16^2+x^2$
$a^2b^3-a^2+2b^3-2$
$x+6=20$
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