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

[" 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) "varphi=pi/2," (d) "a+B=pi/2]]

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