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Repeted function composition: @@

With Xcas, the repeted composition of a function with itself n $ \in$ $ \mathbb {N}$ times is done with the infixed operator @@.
Input :
(sin@@3)(x)
Output :
sin(sin(sin(x)))
Input :
(sin@@2)(pi/2)
Output :
sin(1)



giac documentation written by Renée De Graeve and Bernard Parisse