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BASIC PROGRAMMING GUIDE

2-10

COS

Syntax: COS(

expr

)

Where:

expr

= numeric value up to ±200,000

Function: Returns the trigonometric cosine of

expr

which is in radians.

Mode: Command, run

Use: PRINT COS(PI)

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.

ERROR

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

10 PRINT SIN(PI/2),COS(10*PI),TAN(8*PI/4)

20 PRINT ATN(PI)

>run

1 1 0

1.2626272

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 83 84

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