$\left(6-8y\right)\left(8y-6\right)$
$-4u+4=4\left(u-3\right)$
$144y^2+144y+36$
$\frac{2x^4-15x^3-30x^2-20x+42}{x+9}$
$\cos\left(x-60\right)+\cos\left(x+60\right)$
$11\:+\:\left[5\:+\:8\::\:\left(-2\right)\right]\:$
$y=x^2+4x$
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