solve this √3+√7 by √3-√7
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(√3+√7 )/(√3-√7)
={ (√3+√7)(√3+√7)}/ (√3-√7)(√3+√7)
= (3 +2√21 +7)/3-7
= (10 +2√21)/(-4)
= - 5/2 - √21/2
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