$\lim_{x\to\infty}\left(\frac{\sqrt{x+1}-3x}{x+2x}\right)$
$a^8+7a^{-\frac{3}{5}}$
$\left(4m+5n^3\right)^2$
$dy=2xdx$
$\frac{dy}{dx}=\frac{9xy}{9x^2+2y^2}$
$\left(3k^4\:+\:11k^2\right)\:+\:\left(8k^2\:+\:9k^4\right)$
$a^2-36$
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