There are many laws of logarithms, I do not know which
three you are referring you.
Here are a few laws that are
commonly used:
log(a*b) = log a + log b, used while
multiplying numbers
log(a/b) = log a - log b, used while
dividing numbers
log(a^n) = n*log a, used to find the power
of a number
log(a) b = [log(c) b] / [log(c) a], used to
change the base of the log from a to c
log(b) a = 1/ log(a)
b
log(a) a = 1
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