Calculate log base 10, natural log (ln), log base 2, and any custom base logarithm.
log(a × b) = log(a) + log(b)
log(a / b) = log(a) - log(b)
log(aⁿ) = n × log(a)
logₐ(x) = ln(x) / ln(a)
log₁₀(10) = 1 | ln(e) = 1 | log₂(2) = 1