acos

Summary

Returns the arc cosine (or inverse cosine) of a number.

Syntax

Math.acos( number )

number

Required. The required number argument is a numeric expression.

Return Value

The arc cosine of the number argument, in radians.

Examples

The following code shows how to use the acos function.

var v1 = Math.acos(-1.0);
 var v2 = Math.cos(-1.0);

 document.write(v1);
 document.write("<br/>");
 document.write(v2);

 // Output:
 // 3.141592653589793
 // 0.5403023058681398

Remarks

Applies To : Math Object

See also

Other articles

• Math.asin Function
• Math.atan Function
• Math.cos Function
• Math.sin Function
• Math.tan Function
• Math Object

Attributions

• Microsoft Developer Network: Article