Find the distance between the points A and B in the following :
(i) A(2, 3), B(4, 1) (ii) A (a, b), B(-a, -b) (iii) A(5, -8); B(-7, -3)
(iv) A(4, 10), B(7, -6) (v) A (a + b, a - b), B(a - b, -a - b).
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