Question

Need help to simplify this...

Answer 1

So I know \[(1-u^2)(1-u^2)u^2\]

Answer 2

The \[(1-u^2)(1-u^2)\]
\[1-u^2-u^2+2u^4\]

Answer 3

Or\[1-u^4+2u^4 (u^2)\]

Answer 4

Or \[u^2-2u^6+3u^6?\]