$\frac{d^4}{dx^4}\left(9\cdot\sec\left(x\right)\right)$
$\left(p+q+6\right)\cdot\left(p+q-6\right)$
$81+-71+91$
$27^{3n+6}+27^{3n+6}$
$\sqrt{5}+3\sqrt{5}-6\sqrt{5}$
$6\:\frac{3}{2}$
$60+7t-t^2$
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