xA/xB = x(A - B)
If A = B, then the result of this operation is x0.
But if A = B, then the numerator and denominator of the fraction
are the same number, so the value of the fraction is ' 1 '.
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Any number to the power of zero equals one.
By definition, any number raised to the zero power is "one".
The value of any nonzero number raised to the zero power will equal positive one (1).
Any number raised to the power zero is equal to one. (However, 00 isn't defined.)
Because that value has been established by convention. Any number raised to the power of zero equals one. See the related question.