COS

COS(number)

Returns the cosine of a number.

number

The number you want the cosine of.

REMARKS

* For an illustrated example refer to the [[Trigonometric Functions]] page.
* The inverse of this function is the ACOS function.
* The cosine of a number is 1/SEC.
* This function is periodic with a period of 2PI.
* The "number" is the angle in radians.
* If "number" is not numeric, the #VALUE! is returned.
* If your argument is in degrees, multiply it by PI/180 to convert it to radians.
* If your argument is in radians, multiply it by 180/PI to convert it to degrees.
* You can use the ACOS function to return the arc-cosine.
* You can use the ACOT function to return the the arc-cotangent.
* You can use the SIN function to return the sine.
* You can use the TAN function to return the tangent.
* You can use the DEGREES function to convert from radians to degrees.
* The equivalent VBA function is VBA.COS
* For the Microsoft documentation refer to support.microsoft.com
* For the Google documentation refer to support.google.com

	A
1	=COS(0) = 1.000
2	=COS(0.5) = 0.878
3	=COS(1) = 0.540
4	=COS(PI()/2) = 0.000
5	=COS(2.5) = -0.801
6	=COS(PI()) = -1.000
7	=COS(-0.5) = 0.878
8	=COS(-1) = 0.540
9	=COS(-PI()/2) = 0.000
10	=COS(-2.5) = -0.801
11	=COS(-PI()) = -1.000
12	=COS(45*PI()/180) = 0.707
13	=COS(60*PI()/180) = 0.500
14	=COS(90*PI()/180) = 0.000
15	=COS(120*PI()/180) = -0.500
16	=COS(180*PI()/180) = -1.000
17	=COS(360*PI()/180) = 1.000
18	=COS(ACOS(0.017)) = 0.017
19	=COS("some text") = #VALUE!

1 - What is the cosine of 0 radians.
2 - What is the cosine of 0.5 radians.
3 - What is the cosine if 1 radian.
4 - What is the cosine of (PI/2) radians.
5 - What is the cosine of 2.5 radians.
6 - What is the cosine of PI radians.
7 - What is the cosine of -0.5 radians.
8 - What is the cosine of -1 radian.
9 - What is the cosine of (-PI/2) radians.
10 - What is the cosine of -2.5 radians.
11 - What is the cosine of -PI radians.
12 - What is the cosine of 45 degrees.
13 - What is the cosine of 60 degrees.
14 - What is the cosine of 90 degrees.
15 - What is the cosine of 120 degrees.
16 - What is the cosine of 180 degrees.
17 - What is the cosine of 360 degrees.