$\tan=\frac{1}{6}$
$\left(x^{-1}-3\right)\left(x^7-4\right)\left(-4x^3-3x^7\right)\left(5-x\right)$
$\cos\frac{\pi}{3}\cos\frac{\pi}{6}+\sin\frac{\pi}{3}\sin\frac{\pi}{6}$
$q^{-2}$
$\frac{d}{dx}\ln\left(\sqrt{\frac{1-sinx}{1+sinx}}\right)$
$9+10n+1$
$x^2+30x-225$
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