JavaScript - calculate cos in degrees

In this article, we would like to show you a simple example of how to calculate cos in degrees in JavaScript.

In order to use this example we just need to change the value of deg variable to some other value (in degrees).

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function calculateCos(deg) {

    var rad = (Math.PI / 180) * deg;

    return Math.cos(rad);

}

​

var deg = 30;

var y = calculateCos(deg);

​

// cos(30 deg) = 0.8660254037844387

console.log('cos(' + deg + ' deg) = ' + y);

We can change deg to other values.

Example of common calculations:

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cos(0 deg) = 1

cos(30 deg) = 0.8660254037844387

cos(45 deg) = 0.7071067811865476

cos(60 deg) = 0.5000000000000001

cos(90 deg) = 6.123233995736766e-17

I've prepared a similar post but for calculation sin in degrees:

• JavaScript - calculate sin in degrees