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If the pair of lines ax2+2(a+b)xy+by2=0 lie along diameters of a circle and divide the circle into four sectors such that the area of one of the sectors then
there are 4 sector let area of three sector is t each then area of bigger sector = 3ttotal area = 6t so angle between these two lines will be 120 now apply fromula to finding angle between two lines for pair of lines
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