For example, the sine of PI()/6 radians (30) returns the ratio 0.5.
The function is periodic, so after a full rotation, the output of the function repeats.
Geometrically, the function returns they-component of the point corresponding to an angle on the unit circle.
The function’s output will always be in the range [-1, 1].
To supply an angle to COS in degrees, use the RADIANS function to convert to radians.
TAN Function
The Excel TAN function returns the tangent of the angle given in radians.
RADIANS Function
The Excel RADIANS function converts degrees to radians.
