Problem

Problem

If dd is the distance between the parallel tangents with positive slope to y2=4xy^2 = 4x and x2+y2−2x+4y−11=0x^2 + y^2 - 2x + 4y - 11 = 0 , then a. 10<d<2010 < d < 20 b. 4<d<64 < d < 6 c. d<4d < 4 d. None of these

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