- - Function: asin ARG
- The value of `(asin ARG)' is a number between -pi/2 and pi/2
- (inclusive) whose sine is ARG; if, however, ARG is out of range
- (outside [-1, 1]), then the result is a NaN.
+ - Function: asin number
+ The value of `(asin NUMBER)' is a number between -pi/2 and pi/2
+ (inclusive) whose sine is NUMBER; if, however, NUMBER is out of
+ range (outside [-1, 1]), then the result is a NaN.
+
+ - Function: acos number
+ The value of `(acos NUMBER)' is a number between 0 and pi
+ (inclusive) whose cosine is NUMBER; if, however, NUMBER is out of
+ range (outside [-1, 1]), then the result is a NaN.