(m+1)³+m(m+1)²+m(m+1)+m+1

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(m+1)³+m(m+1)²+m(m+1)+m+1
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(m+1)³+m(m+1)²+m(m+1)+m+1
(m+1)³+m(m+1)²+m(m+1)+m+1

(m+1)³+m(m+1)²+m(m+1)+m+1
(m+1)³+m(m+1)²+m(m+1)+m+1
=(m+1)[(m+1)²+m(m+1)+m+1]
=(m+1)²(m+1+m+1)
=2(m+1)³