# COS Function

#### Purpose:

To return the cosine of the range of x.

#### Syntax:

    COS(x)

#### Comments:

x must be the radians. COS is the trigonometric cosine function. To convert from degrees to radians, multiply by π/180.

COS(x) is calculated in single precision unless the /d switch is used when GW-BASIC is executed.

Example 1:

    10 X=2*COS(.4)
    20 PRINT X
    RUN
     1.842122

Example 2:

    10 PI=3.141593
    20 PRINT COS(PI)
    30 DEGREES=180
    40 RADIANS=DEGREES*PI/180
    50 PRINT COS(RADIANS)
    RUN
     -1
     -1