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PHP Manual
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acos

(PHP 3, PHP 4 )

acos -- Arc cosine

Description

float acos ( float arg)

Returns the arc cosine of arg in radians. acos() is the complementary function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos()' range.

See also acosh(), asin() and atan().

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