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[" The lines "x cos alpha+y sin alpha=p,...

[" The lines "x cos alpha+y sin alpha=p," 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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