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

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 +- beta = pi/2`

Text Solution

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The correct Answer is:
B
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