rationalise the denominator ..(a)2+√5/2-√5
(b)3+√3/4√2
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a) 2+√5/2-√5
rationalising fator of 2-√5 is 2+√5
2+√5/2-√5 × 2+√5/2+√5
4+5/4-5
9/-1
=-9
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