9709 P12 - Jun 2013 - Q2
987
Find the coefficient of \(x^2\) in the expansion of
(i) \(\left( 2x - \frac{1}{2x} \right)^6\),
(ii) \((1 + x^2) \left( 2x - \frac{1}{2x} \right)^6\).
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