people don't like irregulars in the denominator. simplifies the math in longer formulas
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You so stupid
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because in board exams, college entrance exams and other exams, all answers are rationalized, that means no radicals on the denominator. It is simply a standard... nevertheless, it has the same value.
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It can be expressed as either, it really doesn't matter if you have access to a calculator.
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denominators MUST be rationalized
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because denominator are rationalized