math - How to calculate log of a complex number to a base other than 'e'? -

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I have been deducted virtual VB6 from this project: 

   
 
 
 You can use the following mathematical:  
 There <10> log 10 = log (x) / log (10) log2 = log (x) / log (2) "alt text">  
 ... logon = log (x) / log (n)

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