FCClausen[x,y]
gives the Clausen function with arguments x
and y
.
[2, x] FCClausen
[2, x] // Explicit FCClausen
[2, 1.3] FCClausen
[2, 1.3] // N FCClausen
[2, Pi/2, Explicit -> True] FCClausen
[2, Pi/2, Explicit -> True] // StandardForm
FCClausen
(*Catalan*)