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Rpbasic-52 programming guide – Remote Processing BASIC 52 User Manual

Page 40

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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

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