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a triangle A B C with fixed base B C , t...

a triangle `A B C` with fixed base `B C` , the vertex `A` moves such that `cosB+cosC=4sin^2(A/2)dot` If `a ,b and c ,` denote the length of the sides of the triangle opposite to the angles `A , B and C` , respectively, then (a) `b+c=4a` (b) `b+c=2a` (c) the locus of point `A` is an ellipse (d) the locus of point `A` is a pair of straight lines

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CENGAGE PUBLICATION-CONIC SECTIONS-All Questions
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  14. If S and S'' are the foci, C is the centre, and P is a point on a rect...

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  15. Pa n dQ are the foci of the ellipse (x^2)/(a^2)+(y^2)/(b^2)=1 and B is...

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