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Engineering ToolBox > Logarithms

Rules of logarithms

log_b (xy) = log_b x + log_b y (1)

log_b (x/y) = log_b x - log_b y (2)

log_b x^p = p log_b x (3)

log_b (1/x) = - log_b x (4)

log_b b = 1 (5)

log_b 1 = 0 (6)

log_b x = log_a x log_b a (7)