1.

If (sqrt(1 +x^2)+sqrt(1-x^2))/(sqrt(1+x^2)-sqrt(1-x^2))=3thenx=

Answer»

`(-1)/(t^2 (1 + SQRT(1 - t^4)))`
`(t^2 (sqrt(1 - t^4) - 1))/(t^6)`
`(1)/(t^2 (1 + sqrt(1 - t^4)))`
`(1 - sqrt(1 - t^4))/(t^6)`

ANSWER :A::B


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