In a triangle ABC with fixed base BC, the vertex A moves such tha cosB – McqOptions

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1.	In a triangle ABC with fixed base BC, the vertex A moves such tha cosB cosC = 4sin2 A2. If a, b and c denote the lengths 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.	locus of point A is an ellipse
D.	locus of point A is a pair of straight lines
Answer» D. locus of point A is a pair of straight lines

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