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/
now rationalise the numerator by multipling wit sqrt 7 on both numerator and denominator
*
/
- 3*7/
-21/
-21/
now rationalise the denominator by multipling with
to both numertor and denominator
-21 * (
)/
-21 * (
)/169 - 7
-21 * (
)/162
-7* (
)/54
(