Remote Processing BASIC for the CX-10 Modbus - Manual (Page 78)

BASIC PROGRAMMING GUIDE
2-69
TAN
Syntax: TAN(expr)
Function: Returns the trigonometric tangent (sin/cos) of expr which is assumed to be in radians. expr must be
in the range of +/- 200,000.
Mode: Command, run
Use: PRINT TAN(PI/4)
DESCRIPTION
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.
ERRORS
ARITH. UNDERFLOW value or result is less than BASIC-52's smallest floating-point value of ± 1E-127
ARITH. OVERFLOW
value or result is greater than BASIC-52's largest floating-point value of
±.9999999E+127
DIVIDE BY ZERO Attempt to take TAN(X) when COS(PI/2) = 0
EXAMPLES
100 PRINT SIN(PI/2),COS(10001*PI),TAN(5*PI/4)
110 PRINT ATN(TAN(PI/4))/PI
>run
1 -1 1
.24999996