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Elementary Functions > ArcTan[z] > Transformations > Transformations and argument simplifications > Argument involving basic arithmetic operations

Involving tan-1(2z/1-z2) (10 formulas)

>   Involving tan-1(2 z/1-z2) and tan-1(z) (5 formulas)
>   Involving tan-1(2 z/1-z2) and tan-1(1/z) (5 formulas)