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Yikes, those all look overly complicated up there..
If I recall my old high school math, this is how it was taught to me:
Let's take x squared for a simple example: x^2
(x^2) / (x^2)
To solve this, we would subtract the exponents...so 2-2=0
We end up with:
x^0
Also, with basic math we know that any number divided by itself equals 1.
Therefore we end up with:
(x^2) / (x^2) = x^0
(x^2) / (x^2) = 1
And so:
x^0 = 1
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