rationalise the denominator
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1/✓2+✓3-✓5
( ✓2+✓3+✓5) / ( ✓2+✓3-✓5)(✓2+✓3+✓5)
(✓2+✓3+✓5)/ (✓2+✓3)^2 - (✓5)^2
(✓2+✓3+✓5)/2+3+2✓6-5
(✓2+✓3+✓5)/2✓6
(✓2+✓3+✓5) * ✓6/2✓6*✓6.
(( multiplying both nominator and denominator by ✓6 ))
✓2*✓6+✓3*✓6+✓5*✓6/12
2✓3+3✓2+✓30/12
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