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[" If "1" the straight lines "ax+by+c=0"...

[" If "1" the straight lines "ax+by+c=0" and "x cos alpha+y sin alpha=c" enclose an angle "pi/4" uetwotin "],[[" the straight line "x sin alpha-y cos alpha,=0" in the same point,then "],[(a)a^(2)+b^(2)=c^(2),(b)a^(2)+b^(2)=2,(c)a^(2)+b^(2)=2c^(2)]]

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