$2\sin2x\cos2x$
$-\frac{5376}{-96}$
$\left(5ax^4+6b^2y^5\right)^3$
$\frac{\left(cos3x-cos5x\right)}{\left(cosx\:-\:cos3x\right)}=2cos2x$
$\lim_{x\to0}\left(\frac{tan\left(2x\right)+sin\left(9x\right)}{x}\right)$
$-77\left|-56-65-54+\left(-8\right)\right|$
$\left(6x-11y\right)\left(13y+6x\right)$
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