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  4. The lines x cos α + y sin α = p1 and x cos' (β + y sin β = p2 will be perpendicular if

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Q. The lines $x \, cos\, \alpha\, +\, y\, sin\, \alpha = p_1\, and\, x\, cos' (\beta + y sin \beta = p_2 $will be perpendicular if

Solution:

Correct answer is (b) $|\alpha-\beta|=\frac{pi}{2}$