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[" Line "ax+by+p=0" makes an angle "(pi)...

[" Line "ax+by+p=0" makes an angle "(pi)/(4)" with "],[x cos alpha+y sin alpha=p,p in R^(+)" .If these lines and the "],[" line "x sin alpha-y cos alpha=0" are concurrent,then "],[[" (1) "a^(2)+b^(2)=1," (2) "a^(2)+b^(2)=2]]

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