$\frac{5}{4}+\frac{2}{7x}\le\frac{9}{4}-\frac{6}{5}$
$-x^2-8x-11$
$x^3-15^2+450$
$\frac{d^2y}{dx^2}=\frac{4x^5}{5}-7x$
$\frac{x^7-128}{x-2}$
$\lim_{x\to0}\left(\sqrt[x]{\cos\left(\sqrt{x}\right)}\right)$
$27p^3+q^3$
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