[" (a) "(7)/(sqrt(5))],[" The lines "x c...

[" (a) "(7)/(sqrt(5))],[" 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]]

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