PHP. Руководство по PHP. 2005

acos

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acos

(PHP3, PHP4, PHP5)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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