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If the points (a(1),b(1))m(a(2),b(2))" a...

If the points `(a_(1),b_(1))m(a_(2),b_(2))" and " (a_(1)-a_(2),b_(2)-b_(2))` are collinear, then prove that `a_(1)/a_(2)=b_(1)/b_(2)`

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