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If the equation x^4 -λx^2 +9=0 has only ...

If the equation `x^4 -λx^2 +9=0` has only two real roots, then the set of values of `λ` is

A

`(-oo,-6)`

B

`(-6,6)`

C

`{6}`

D

none

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The correct Answer is:
D
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