$\cos\left(2a\right)=\cos\left(a\right)$
$\frac{36}{6}$
$\frac{9\frac{-2}{3}^{-3}\:d^2}{5\frac{5}{2}^{-4}\:\frac{5}{4}^3}+\frac{\frac{-1}{2}^{-4}\:\frac{1}{3}^3\:\frac{1}{2}^{-2}}{32}$
$\left(1+6x\right)^4$
$64r^3-8t^6$
$4x^2+20x^2+25x$
$\left(y+4\right)\left(y-2\right)$
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