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a²+2ab+b²=16ab
(a+b)²=16ab
(1/16)*(a+b)²=ab
log[(1/16)*(a+b)²]=log(ab)
21log[(1/4)*(a+b)]=log(ab)
log[(1/4)*(a+b)]=1/2*log(a)+1/2*log(b)
:3