$\left(\left(x-y\right)-1\right)\left(\left(x-y\right)+1\right)$
$144a^2-64b^2$
$3\:-18\:-12\:+\:5\:+\:3$
$x^4-5x^2-x+16;x=9$
$\int\cos^4\left(4\right)\left(x+2\right)dx$
$2^5\cdot4^5$
$\left(a^3+\frac{1}{5}\right).\left(a^3-\frac{1}{5}\right)$
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