Find the set of values of ' \( a \) ' if \( \left(x^{2}+x\right)^{2...

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Find the set of values of ' \( a \) ' if \( \left(x^{2}+x\right)^{2}+a\left(x^{2}+x\right)+4=0 \) has
\( \mathrm{P} \) four roots in which only two roots are real and distinct.

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