1.

If F_1 and F_2 are foci of the hyperbola x^2/a^2-y^2/b^2=1 and Pis any point on the hyperbola, then : ||PF_1|-|PF_2|| is equal to :

Answer»

`2A`
`2B`
`a+b`
`|a-b|`

ANSWER :A


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