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

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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)`
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Correct Answer - D
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