Locus of z such that |z−z1|−|z−z2|=λ (constant) is:
A
Circle
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B
Parabola
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C
Ellipse
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D
Hyperbola
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Solution
The correct option is D Hyperbola Difference of distances of a point from two fixed points z1 and z2 is constant. Thus this is the basic definition of a hyperbola.