First slide
Hyperbola in conic sections
Question

 If the eccentricity of the hyperbola x2y2sec2θ=5 is 3 times the eccentricity of the 

 ellipse x2sec2θ+y2=25, and smallest positive value of θ is πP then twice the value of 'p'is

Easy
Solution

 Eccentricity of the hyperbola x2y2sec2θ=5 is 

equation is x25-y25sec2θ=1

e1=1+sec2θsec2θ=1+cos2θ Eccentricity of the ellipse x2sec2θ+y2=25 is x225sec2θ+y225=1e2=sec2θ1sec2θ=|sinθ| Given e1=3e21+cos2θ=3sin2θcosθ=±12 Least positive value of θ is π4P=42P=8

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