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2010-01-24T15:29:38+01:00
Log12=a
log2=b

a = log12
a = log(3*4)
a = log3 + log4
a = log3 + log2²
a = log3 + 2log2
a = log3 + 2b
log3 = a - 2b

log90 = log(10*9) = log10 + log9 = 1 + log3² = 1 + 2log3
log90 = 1 + 2(a - 2b) = 1 + 2a - 4b
log90 = 1 + 2a - 4b
45 4 45