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The locus of equation x^(2)+y^(2)+z^(2)+...

The locus of equation `x^(2)+y^(2)+z^(2)+1=0` is

A

an empy set

B

a sphere

C

a pair of planes

D

a line

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The correct Answer is:
A
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AAKASH SERIES-3D-COORDINATE SYSTEM-EXERCISE-1
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  12. Locus of a point 'P' such that PA+PB =4, where A=(2,3,4), B=(-2,3,4) i...

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  13. Locus of x/a+y/b=1 and z = 0 is

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