(a) Find the first three terms in the expansion of

\(\left(x^2-\frac4{x^2}\right)^{10}\)

in descending powers of \(x\). Give each term in its simplest form.

(b) Hence find the coefficient of \(x^{16}\) in the expansion of

\(\left(x^2-\frac4{x^2}\right)^{10}\left(x^2+\frac2{x^2}\right)^2.\)