acos

acos

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Calculates the inverse cosine of a number

 #include <math.h> double acos ( double x  ); float acosf ( float x  );         (C99) long double acosl ( long double x  );         (C99) 

acos( ) implements the inverse cosine function, commonly called arc cosine. The argument x must be between -1 and 1, inclusive: -1 x 1. If x is outside the functions domainthat is, greater than 1 or less than -1the function incurs a domain error.

The return value is given in radians, and is thus in the range 0 acos(x)

This code produces the following output:

 The pitch of the roof is 30 degrees. 

See Also

The arc cosine functions for complex numbers: cacos( ), cacosf( ), and cacosl( )