COS (Cosine)
The COS function returns the cosine of an angle.
Syntax
COS ( angle )
Example
'This program calculates the sine, cosine, and tangent of angles from 0 to 360 at 30 degree intervals.
'Results are sent to Trig Table every 2 seconds.
Const Pi = 4 * ATN(1) 'Declare Pi as a constant
Public Degrees, Radians, Cosine, Sine, Tangent 'Declare variables
DataTable(Trig,True,-1)
'Sample variables in Trig Table
Sample(1,Degrees,FP2)
Sample(1,Radians,FP2)
Sample(1,Sine,FP2)
Sample(1,Cosine,FP2)
Sample(1,Tangent,FP2)
EndTable
'MainProgram
BeginProg
Scan(2,sec,0,0)
If Degrees >= 360 Then Degrees =0 'When degrees reaches 360, reset degrees to zero
Radians = Degrees*(Pi/180) 'Calculate angle in radians
Sine = SIN(Radians) 'Calculate sine of angle
Cosine = COS(Radians) 'Calculate cosine of angle
Tangent = TAN(Radians) 'Calculate tangent of angle
'Note: Tangent is undefined at 90 and 270 degrees. Table will show tan(90) = tan(270) = -7999
CallTable(Trig) 'Call Trig Table
Degrees+=30 'Increment angle by 30 degrees
NextScan
EndProg
Remarks
The COS function takes an angle and returns the ratio of two sides of a right triangle. The ratio is the length of the side adjacent to the angle divided by the length of the hypotenuse. The result lies in the range -1 to 1.
The Angle argument can be any valid numeric expression measured in radians.
AngleDegrees can be used to change the source for this function to degrees instead of radians.
To convert degrees to radians, multiply degrees by Pi/180. To convert radians to degrees, multiply radians by 180/Pi. Pi is approximately 3.141593.