log 1 = 0
if log of base 10 of a number, N, is X
logN = X means
10 to the X power = N
10^x = 1
x = 0 since 10^0 = 1
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log(21.4) = 1.330413773
log AB^2 log A+log B+log2
-1.958607315
0.0706
A logarithm of a reciprocal. For example, log(1/7) or log(7-1) = -log(7)