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C programming/math.h/acos
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The acos() function (which stands for arc cosine) is defined in math.h. It accepts a variable, returns the arc cosine value of the variable. This function expects the values in the range of -1 to 1 and values are returned in the range 0 to PI (3.1415927). It prints NAN if a value greater than 1 is passed.
Syntax
float acos(float x);
Parameters
Floating point value whose arc cosine value has to be returned.
Returns
Floating point value (arc cosine value of variable).
References
The C Programming Language, Second Edition, By Brian W. Kernighan and Dennis M. Ritchie, Page no. 251
Programming With C, Second Edition, By Gottfried, Page no 487
External Links
acos at cplusplus
acos at en.cppreference.com
ACOS at idlastro.gsfc.nasa.gov
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