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The locus of a point reprersented by x=a...

The locus of a point reprersented by `x=a/2((t+1)/t),y=a/2((t-1)/t)` , where `t in R-{0},` is (a) `x^2+y^2=a^2` (b) `x^2-y^2=a^2` (c)`x+y=a` (d) `x-y=a`

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