Question

. 1/1 + x ^ l-m + x ^ n-m + 1/1 + x ^ m-l + x ^ n-l + 1/1 + x ^ l-n + x ^ m-n =

Answer 1

Answer:

${x}^{m + n} (2 {x}^{2(m + n + 1)}) + {x}^{m + 1} (2 {x}^{2(n + 1 + m)} ) + {x}^{n + 1} (2 {x}^{2(m + n + 1)} )$

hope it helps, thank you