Remote Processing BASIC 52 - Manual (Page 40)

RPBASIC-52 PROGRAMMING GUIDE
2-21
COS
Syntax: COS(expr)
Where: expr = numeric value up to ±200,000
Function: Returns the trigo nometric co sine of expr which is in radians.
Mode: Comm and, run
Use: PRINT COS (PI)
Cards: All
D E S C R IP T I ON
SIN, COS, and TAN operators use a Taylor series to calculate the function. These operators first reduce the
argument to a value that is between 0 and PI/2. the algorithm used to reduce the value will reduce accuracy
when value is large. To maintain accuracy, keep the arguments for trig functions as small as possible.
E R R O R
A R I T H . U N D E R F L O W value or result is less than RPBASIC-52's smallest floating-point value of ±1E-127
A R I T H . O V E R F L O W value or result is greater than RPBASIC-52's largest floating-point value of
±.9999999E+127
D I V I DE B Y Z E R O Attempt to take TAN(X) when COS(PI/2) = 0
EXAMPLES
10 PRINT SIN(PI/2),COS(10*PI),TAN(8*PI/4)
20 PRINT ATN(PI)
>run
1 1 0
1.2626272