Question 820530
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Hi,
Multiplying Numerator and Denominator by {{{( 4+sqrt(3))}}}
{{{13/(4-sqrt(3)) = 13(4+sqrt(3))/13 =(4+sqrt(3)) }}} as 
denominator becomes: {{{(4-sqrt(3))( 4+sqrt(3)) = 16-3 = 13}}}