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2.23.3  Expand logarithms : lnexpand

lnexpand takes as argument an expression with logarithms.
lnexpand expands this expression (rewrites ln of products as sum of ln).
Input :

lnexpand(ln(3*x^2)+ln(2*x+2))

Output :

ln(3)+2*ln(x)+ln(2)+ln(x+1)

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