The angle between pair of tangents drawn to the curve 7x2- – 12y2 = 84 from M(1, 2) is
a) 2tan-1 1/2 b) 2tan-12 c) 2(tan-11/3 + tan-1 1/2) d) 2tan-1 3
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1 Answers
1firstly find the eq of pair of tangents from point(1,2) to the hyperbola
and now since this eq represents pair of straight lines
use the formula of angle between them i.e θ=tan-1(2√(h2-ab)/(a+b) a,b,h denote normal coefficents in standard eq of pair of st lines
