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Obtain all other zeroes of 3x^4+6x^3-2x^...

Obtain all other zeroes of `3x^4+6x^3-2x^2-10 x-5`, if two of its zeroes are `sqrt(5/3)`and `-sqrt(5/3)`.

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The correct Answer is:
all zeroes are `sqrt(5//3),-sqrt(5//3), -1` and `-1`.
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