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= 4/14√3. √3/√3
= 4√3 / 14.3
= 4√3 / 42
= 4/42 √3
= 2/21√3
4 b. 5√13 / √91 = 5√13 / √91 . √91/√91
= 5√13.√91/ 91
= 5√1183 / 91
= 5/91 √1183
4. c. 6/ 4+ 2√5 = 6/ 4+ 2√5 . 4-2√5/ 4-2√5
= 6 (4-2√5) / 16- 4.5
= 24-12√5 / -4
= -6 - 12√5