Rewrite the expression
\(\ln (a+b) + 4 \ln (a-b) - 3 \ln c\)
as a single logarithm \(\ln A.\) . Then the function A=
Ln A = Ln {[(a+b)(a-b)^4]/(c^3)}
A = [(a+b)(a-b)^4]/(c^3)
+81 
