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acos

(PHP 4, PHP 5)

acosArc cosine

Description

float acos ( float $arg )

بازگرداندن آرک‌کوسینوس arg به رادیان. acos() تابع مکمل cos() است و به معنای a==cos(acos(a)) برای هر مقدار در بازه acos()' است.

Parameters

arg

آرگومان برای پردازش

Return Values

آرک‌کسینوس arg به رادیان.

See Also

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User Contributed Notes 1 note

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zoltan dot szentesi at nokia dot com
8 years ago
Wondering what is the use of 'acos' function?

It is essential in games, animations and drawings to determine the location of two objects relating to each other.

To the point: the angle of two vectors is calculated by

           v1X*v2X + v1Y*v2Y
  acos(--------------------------)=angle between two vectors.
               |v1| * |v2|

|v1| and |v2| are the length of the vectors and calculated using Pithagoras-formula: |v1|=sqrt(v1X*v1X + v1Y*v1Y)

This helped me to calculate and share given space for 'n' amount of objects so that they don't overlap.

Enjoy! :-)
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