TI-BASIC:Cos
Command Summary
Returns the cosine of a real number.
Command Syntax
cos(angle)
Menu Location
Press [COS]
TI-83/84/+/SE
1 byte
cos(θ) returns the cosine of θ, which is defined as the x-value of the point of intersection of the unit circle and a line containing the origin that makes an angle θ with the positive x-axis
The value returned depends on whether the calculator is in Radian or Degree mode. A full rotation around a circle is 2π radians, which is equal to 360°. The conversion from radians to degrees is angle*180/π and from degrees to radians is angle*π/180. The cos( command also works on a list of real numbers.
In radians:
cos(π/3) .5
In degrees:
cos(60) .5
Advanced Uses
You can bypass the mode setting by using the ° (degree) and ^{r} (radian) symbols. These next two commands will return the same values no matter if your calculator is in degrees or radians:
cos(60°) .5
cos(π/3^r) .5
Error Conditions
- ERR:DATA TYPE is thrown if you supply a matrix or a complex argument.
- ERR:ARGUMENT is thrown if you use more than one number.