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Let L1L′1 and L2L′2 be the latus rectum of the ellipse x216+y215=1. If S1=0,S2=0 are the two circles having L1L′1 and L2L′2 as diameters, then the number of common tangents to S1=0 and S2=0 is

Answer» Let L1L1 and L2L2 be the latus rectum of the ellipse x216+y215=1. If S1=0,S2=0 are the two circles having L1L1 and L2L2 as diameters, then the number of common tangents to S1=0 and S2=0 is


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