Using an appropriate quadratic factorisation, find the first three terms in the binomial expansion of \((9x^2+12x+4)^5\), in ascending powers of \(x\).
You must simplify your coefficients.[4]
Find the term independent of \(x\) in the expansion of \(\left(\dfrac6{x^2}+\dfrac{x^4}2\right)^{12}\).[2]
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