Solve Q 10 all three parts           

10.By rationalising the denominator of each of the following; find, in each case, the value correct to two significant figures :

(i) $\frac{1}{3-\sqrt{2}}$

(ii) $\frac{1}{2+\sqrt{3}}$

(iii) $\frac{4}{2\sqrt{2}+2\sqrt{3}}$