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The simplest way is to make an opposite action of applying exponents. For example if you square 3, you get 9. If you want to have a square root of 9, it is 3. When it comes o fraction, analogically, look at the example:  \sqrt{\frac{1}{4}}  =  \frac{ \sqrt{1}}{ \sqrt{4} }  =  \frac{1}{2}
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