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