six *n*(two *n^ two /(n + one)^ two - three *n/(n + one) + one)/(n + one)^ three = zero
6 multiply by n multiply by (2 multiply by n squared divide by (n plus 1) squared minus 3 multiply by n divide by (n plus 1) plus 1) divide by (n plus 1) cubed equally 0
six multiply by n multiply by (two multiply by n to the power of two divide by (n plus one) to the power of two minus three multiply by n divide by (n plus one) plus one) divide by (n plus one) to the power of three equally zero