Name:
 acos 
the arccosine function. 
 
  
 
Library names:
 
sollya_obj_t sollya_lib_acos(sollya_obj_t) 
sollya_obj_t sollya_lib_build_function_acos(sollya_obj_t) 
#define SOLLYA_ACOS(x) sollya_lib_build_function_acos(x) 
 
 
Description: 
 
- acos is the inverse of the function cos: acos(y) is the unique number  
x in [0; Pi] such that cos(x)=y. 
- It is defined only for y in [-1; 1]. 
  
 
 
 
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