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The lines x cos alpha + y sin alpha = P1...

The lines `x cos alpha + y sin alpha = P_1 and x cos beta + y sin beta = P_2` will be perpendicular, if :

A

`alpha=(pi)/(2)`

B

`alpha =beta`

C

`alpha+-beta=(pi)/(2)`

D

`|alpha-beta|=(pi)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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