ACOS

Member Of Menu: 
Trig
Argument Types: 
Real
Complex
Symbol
Expression
Result Type(s): 
Real
Complex
Expression
Invertible: 
Yes
Valid In Expression: 
Yes
Stack Diagram: 
Real1 → Real2
Real1 → Complex2
Complex1 → Complex2
Symbol1 → Expression2
Expression1 → Expression2

This operation calculates the inverse cosine function of its argument. Note that the result depends on the whether the DEG (degree) or RAD (radians) mode is on. For real valued results, the result is expressed as an angle in degrees if DEG is on. For real valued results, the argument is expressed as an angle in radians if RAD is on. For complex arguments, the result is always expressed in radians.

The result lies in the range of 0 to 180 degrees if operating in degree mode, or in the 0 to π range if operating in radian mode.