[" (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 "],[[" (b) "| alpha-beta|=pi/2," (c) then the point "]]

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