rationalise the denominator of 3+root 5 by 3-root 5
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3+√5/3-√5
(3+√5)(3+√5)/(3-√5)(3+√5)
(3+√5)²/3²-(√5)²
3²+(√5)²+2×3×√5/9-5
9+5+6√5/4
14+6√5/4
2(7+3√5)/4
7+3√5/2
(3+√5)(3+√5)/(3-√5)(3+√5)
(3+√5)²/3²-(√5)²
3²+(√5)²+2×3×√5/9-5
9+5+6√5/4
14+6√5/4
2(7+3√5)/4
7+3√5/2
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