Factor
\left(l+1\right)\left(m+1\right)
Evaluate
\left(l+1\right)\left(m+1\right)
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l\left(m+1\right)+m+1
Do the grouping lm+l+m+1=\left(lm+l\right)+\left(m+1\right), and factor out l in lm+l.
\left(m+1\right)\left(l+1\right)
Factor out common term m+1 by using distributive property.
Examples
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