The cosine function is defined in a right-angled triangle as the ratio of the adjacent side and the hypotenuse. Its graph is a cosine curve. The function is defined from - to and takes values from -1 to 1.


Cosine - Graph


Right-angled triangle
Trigonometric formulas Trigonometric formulas


Enter the angle α

α =
cos α =
Round to decimal places.

Enter the cos α value and select the angular unit

cos α =
α1 =
α2 =
Round to decimal places.

Related Links

We will be happy to receive your suggestions and comments.

Our website uses cookies to provide services.

More information

You don’t like ads? Neither do we, but advertising revenue allows us to operate our website and provide free services to our visitors. Please consider disabling ad blocking on this website. Thank you.