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James Birdsall

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Using the Pythagoreum Identity
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Can someone explain to me how we get from 1-(11/61)^2 to 3600/3721 ? Why not 121/3600? Also, is there a way to thank folks that answer a question?
Square roots of negative numbers
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sqrt (-48) is the problem. So, I get it simplifies to sqrt (48) i. Then I get 4*sqrt(12)i. But I don't see how you get 4*sqrt(3)i which is the answer. Can someone help with the missing step. What a...