Find the distance between the following pairs of points:
(i) (-3, 6) and (2, -6)
(ii) (-a, -b) and (a, b)
(iii) (3/5, 2) and (-1/5,7/5)
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2.Let A(a,b)≡(x
1
,y
1
) and B(−a,−b)≡(x
2
,y
2
) be the points of a straight line.
AB=
(x
2
−x
1
)
2
+(y
2
−y
1
)
2
AB=
(−a−a)
2
+(−b−b)
2
=
(−2a)
2
+(−2b)
2
=
4a
2
+4b
2
=2
a
2
+b
2
units.
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