$\left(a+2\right)\left(a-2\right)+\left(a-4\right)\left(a+1\right)$
$6-\left(-4\right)-2$
$-x^2+16x+8$
$x^4-4x^4$
$\left(3a^2+b\right)\left(3a^2-b\right)$
$\lim_{x\to3}\left(\frac{x^3+x}{x}\right)$
$2\log3\left(5^x\right)-\log3\left(4^x\right)$
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