1.

A straight line through origin bisect the line passing through the given points \[(a\cos \alpha ,a\sin \alpha )\]and \[(a\cos \beta ,a\sin \beta )\], then the lines are

A. Perpendicular 
B. Parallel
C. Angle between them is \[\frac{\pi }{4}\]
D. None of these
Answer» B. Parallel


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