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If the product of the roots of the equat...

If the product of the roots of the equatiin `2x^2+ax+4sina=0` is 1, then the roots will be imaginary if (A) `aepsilon R` (B) `aepsilon {(-7pi)/6, pi/6}` (C) `aepsilon {pi/6, (5pi)/6}` (D) none of these

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