double
     cos(double x);

     long double
     cosl(long double x);

     float
     cosf(float x);

DESCRIPTION

     The cos() function computes the cosine of x (measured in radians).

SPECIAL VALUES

     cos(+-0) returns 1.

     cos(+-infinity) returns a NaN and raises the "invalid" floating-point
     exception.

SEE ALSO

     sin(3), tan(3), asin(3), acos(3), atan(3), atan2(3), sinh(3), cosh(3),
     tanh(3), math(3)

STANDARDS

     The cos() function conforms to ISO/IEC 9899:1999(E).

BSD                            November 20, 2002                           BSD