$\pi-\frac{\pi^2}{2\pi}$
$\left(4x^3+2y\right)\left(4x^3-2y\right)$
$\frac{d}{dx}\frac{x^6e^x}{cosxsinx}$
$xy^4\:.\:4x^2\:y^4\:.\:2x^4$
$\left(8f^3\right)^2$
$\lim_{x\to\infty}\left(\frac{x}{x\:+\:1}\right)^x$
$-\frac{x+5}{6}-\frac{1-x}{4}\ge\frac{x+3}{6}$
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