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Why did we used pi+ tan inverse (z-x/zx+1) in the 3rd term of cot inverse?

Why did we used pi+ tan inverse (z-x/zx+1) in the 3rd term of cot inverse? 

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Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
Because z -x is negative. Hence to make it in the domain we have used +pi.
 
Hope it helps
 
 
Regards
Arun

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