A(0,4), B(0,-4) are two points. The locus of
P which moves such that PA-PB=6 is
1) 9x2-7y2+63=0
2)9x2+7y2-63=0
3) 9x2+7y2+63=0
4) 9x2-7y2 - 63 = 0
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Answer:
4) 9x2-7y2-63 = 0
it is correct answer
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