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Math function Library: atan2

Source: Internet
Author: User
Keywords atan2 php Chinese function Handbook math function library
Tags aliyun function function library html http php php chinese function handbook php3
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Atan2

(PHP3 >= 3.0.5, PHP4)

atan2---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; The tangent value of two variables

Syntax: float atan2 (float y, float x);

Description:

This function calculates the tangent value of two variables x and Y, which is similar to calculating the Y tangent value of a variable, but this function can use the sign of the parameter x,y to determine the quadrant in which the result is located. The result (diameter) returned by this function is situated between Pi and pi.

Reference: ACOs () Atan ()

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