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PHP in a Nutshell
book

PHP in a Nutshell

by Paul Hudson
October 2005
Intermediate to advanced content levelIntermediate to advanced
372 pages
11h 35m
English
O'Reilly Media, Inc.
Content preview from PHP in a Nutshell

Name

acos()

Synopsis

    float acos ( float num )

The acos() function calculates the arc cosine value of the number provided as its only parameter, essentially reversing the operation of cos(). The return value is in radians—you should use the rad2deg() to convert radians to degrees.

    $acos1 = acos(0.4346);
    $acos2 = acos(cos(80));
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Publisher Resources

ISBN: 0596100671Errata Page