(i) Find, in ascending powers of \(x\), the first 3 terms in the expansion of \(\left(2-\dfrac{x^2}{4}\right)^5\).

(ii) Hence find the term independent of \(x\) in the expansion of \(\left(2-\dfrac{x^2}{4}\right)^5\left(\dfrac1x-\dfrac3{x^2}\right)^2\).