Find the angle between 2 lines A1x+B1y+C1=0 and A2x+B2y+C2=0.
Also find the condition of perpendicularity and parallelism .
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Find the angle between 2 lines A1x+B1y+C1=0 and A2x+B2y+C2=0.
Also find the condition of perpendicularity and parallelism . ....... uiyewdvjlopppooiiuytrewq
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