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The best way to understand this is by observing the following pattern.
x^4=(x)(x)(x)(x)
Now divide both sides by x to get
x^3=(x)(x)(x)
Divide both sides by x again to get
x^2=(x)(x)
Again
x^1=(x)
Again
x^0=1
Hopefully seeing this pattern will at least help you understand why x^0=1. However the real reason is that mathematicians have agreed that this is the best way.
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