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The domain for which the function define...

The domain for which the function defined by `f(x) = 3x^2-1` and `g(x) = 3+x` are equal is

A

1)`{-1,4/3}`

B

2)`{-1,-4/3}`

C

3)`{1,-4/3}`

D

4)`{1,-4/3}`

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The correct Answer is:
A
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