Trigonometric function has sum and difference formula. Does logarithm have sum and difference formula? What is the formula? For example, ln (a + b) =?

lna·lnb

Ln (- 1) is equal to and its principal value

e^（ti） =cost+isint
T = Pai + 2K Pai time
e^（ti）=-1
Ti = pi (1 + 2K)
K is an integer

What is ln (- 1) - ln (- 2) equal to

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