find the value of: √a+√b)(√a-√b)
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√a+√b=√((√a+√b)²)=√((√a+√b)·(√a+√b))=√(√a·(√a+√b)+√b·(√a+√b))
=√(√a·√a+√a·√b+√b·√a+√b·√b)=√(a+2·√a·√b+b)≠√(a+b)
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