cos()  Math  class method JS Home  <<  JS Reference  <<  Math  <<  cos()

Description

Returns the cosine of a number in radians.

  • Radians to Degrees - divide number by (Math.PI / 180).
  • Degrees to Radians - multiply number by (Math.PI * 180).
  • Like all class methods cos() should be used on the class rather than an instance of the class.

Syntax

Signature Description
Math.cos(value)Returns the cosine of a number in radians.

Parameters

Parameter Description
valueThe number you wish to find the cosine in radians for:
  • Non-numeric strings returns NaN.
  • Passing no parameter returns NaN.
  • Passing null returns 1.

Examples

The code below displays cos() usage.


// Store results in an array.
var cosValues = new Array(5);

cosValues[0] = Math.cos(-1);
cosValues[1] = Math.cos(0);
cosValues[2] = Math.cos('0.75');
cosValues[3] = Math.cos('a string');
cosValues[4] = Math.cos();
cosValues[5] = Math.cos(null);

alert(cosValues);  

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JavaScript Advanced Tutorials - Lesson 4 - Math

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E
LN2
LN10
LOG2E
LOG10E
PI
SQRT1_2
SQRT2
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abs()
acos()
asin()
atan()
atan2()
ceil()
cos()
exp()
floor()
log()
max()
min()
pow()
random()
round()
sin()
sqrt()
tan()
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