$-27-54$
$\left(4y-5\right)\left(4y+5\right)$
$\frac{dy}{dx\:}+2xy=x$
$\cos\left(\frac{\pi}{9}+\frac{\pi}{4}\right)+\frac{2}{3}\cos\left(\frac{13\pi}{36}\right)$
$x^2-5x+6,25$
$\frac{x^2}{9x^5}$
$\frac{1-2-2-3}{-2}$
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