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9.2.12 Transforming arctan into arccos

The atan2acos command transforms any arc tangents in an expression to arc cosines by using the identity

arctan(x)=
π
2
−arcsin




x
1+x2





. 

Example

atan2acos(atan(x))
     
π 
2
−arccos




x
1+x2





          

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