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$cos^2x\left(-2sen2x\right)-\left(-2cosxsenx\right)\left(1+cos\:2x\right)$
$6x^5-4x^4+8x^3-2x^2-x+1\left(2x^2-4x\right)$
$\left(\frac{2}{5}x-\frac{1}{4}y\right)^2$
$\int\cos^2\left(3a+1\right)da$
$21.6-22$
$\left(2x^{-2}y^2\right)^3$
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