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laws of exponents

Please help me understand this in detail and also please tell me the math rules that allows for this.

I know that

Y/Y^a equals to Y^(1-a) this is allow by the rule of exponents X^a/X^b = X^(a-b)

Does the same rule apply to this? - If not, please provide the steps to get answer

Y^a/Y equals 1/Y^(1-a)


Solution Summary

It explains the rule of exponents