COS

The COS function returns the cosine of an angle that is expressed in radians.

COS(radian-angle)

radian-angle: A number value representing an angle, expressed in radians. Although radian-angle can be any number, it would normally be in the range –π to +π (–pi to +pi).

Examples
=COS(1) returns 0.54030230586814, the cosine of 1 radian (approximately 57.3 degrees). =COS(RADIANS(60)) returns 0.5, the cosine of 60 degrees. =COS(PI()/3) returns 0.5, π/3 radians (60 degrees). =COS(PI()) returns -1, the cosine of π radians (180 degrees).

Examples

=COS(1) returns 0.54030230586814, the cosine of 1 radian (approximately 57.3 degrees).

=COS(RADIANS(60)) returns 0.5, the cosine of 60 degrees.

=COS(PI()/3) returns 0.5, π/3 radians (60 degrees).

=COS(PI()) returns -1, the cosine of π radians (180 degrees).