cos

Definition and usage

cos() function returns the cosine of a number.

Example

In this case, we will calculate the cosines of different values:

 <?php
echo ( cos ( 3 ) ) ;
echo ( cos ( - 3 ) ) ;
echo ( cos ( 0 ) ) ;
echo ( cos ( M_PI ) ) ;
echo ( cos ( 2 * M_PI ) ) ;
?>

Try it yourself

grammar

 cos ( x )

illustrate

cos() returns the cosine value of the parameter x . The unit of parameter x is radians.