$12+4m$
$\left(5+3x^3\right)^4$
$\left(x+d\right)^6$
$100+50n+n^2$
$x-1.75=2.2$
$\left(x+\sqrt{5}\right)\left(-x+\sqrt{5}\right)$
$\lim_{x\to2}\frac{cos\left(4-2x\right)-1}{ln\left(2x-3\right)}$
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