$\lim_{x\to\pi}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\left(\frac{x^n\left(n+1\right)}{3^n\pi\:^{n+1}}\right)$
$5x^2=9x$
$16x^2-16$
$-451-864$
$a^{\frac{1}{3}}-2+a^{-\frac{1}{3}}$
$\left(-1\right)\cdot\left(-3\right)\cdot\left(-6\right)$
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