At what values of ' \( a \) ' do all the zeroes of the \( \mathrm{P...

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At what values of ' \( a \) ' do all the zeroes of the
\( \mathrm{P} \) function, \( f(x)=(a-2) x^{2}+2 a x+a+3 \) lie on the

W interval \( (-2,1) \) ?
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