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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= beta`

B

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

C

`alpha = pi//2`

D

`alpha pm beta = pi//2`

Text Solution

Verified by Experts

The correct Answer is:
B
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