Related Functions:

The COS function returns the cosine of the given angle.

Syntax

=COS(number)

Arguments

Argument Description
number The angle, in radians, for which you want the cosine

Examples

  A B C
1 Formula Result Notes
2 =COS(1.047) 0.5001711 Cosine of 1.047 radians
3 =COS(60*PI()/180) 0.5 Cosine of 60 degrees
4 =COS(RADIANS(60)) 0.5 Cosine of 60 degrees
5 =COS(RADIANS(-30)) 0.8660254 Cosine of -30 degrees

trigonometry_triangleFor the simple right-angle triangle at right, the cosine of the angle A, is the ratio of the adjacent side (b) to the hypotenuse (h). For the triangle at right, cosine B is calculated as:  

    \[   cos(A) = \left( \frac{b}h \right)    \]

See Wikipedia for more information on Inverse Trigonometric Functions.