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x02 Chapter Introduction
NAG C Library Manual

# NAG Library Function Documentnag_max_sine_argument (X02AHC)

## 1  Purpose

nag_max_sine_argument (X02AHC) returns the largest positive argument for which the C compiler run-time library functions sin and cos return a result with some meaningful accuracy.

## 2  Specification

 #include #include
 double nag_max_sine_argument

## 3  Description

nag_max_sine_argument (X02AHC) is a constant defined in the C Header file.
The trigonometric functions $\mathrm{sin}$ and $\mathrm{cos}$ supplied in some compiler run-time libraries do not return accurate results when their argument is large. Often the related accuracy of a result gets progressively worse as the argument gets larger. nag_max_sine_argument (X02AHC) gives a value beyond which the compiler run-time library returns results with no relative accuracy at all. Note that some run-time libraries do return accurate results for all arguments to $\mathrm{sin}$ and $\mathrm{cos}$.

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