atan2


php128 apg

RETURNS the arc tangent of an argument given in radians using two variables.

Compatible with LOCALE only, up to PHP 7.4.XX.





This function returns de arc tangent of the two variables $x and $y, similar to calculating the arc tangent of $y/$x except that the signs of both are used to determine the quadrant of the result.

This function returns the result in radians, which is between -PI and PI, (inclusive).



<?php

float atan2 ( float $y, float $x )


where,

$y = The dividend parameter

$x = The divisor parameter

?> 

$y


The dividend parameter.



$x


The divisor parameter.



  1 EXERCISE   

<?php

// setlocale(LC_ALL, 'es_ES', 'es-ES');

// FIRST QUADRANT
$sin001 = 0.70710678118655;
$cos001 = 0.70710678118655;
$ata001 = atan2($sin001, $cos001);
$gra001 = rad2deg($ata001);

// SECOND QUADRANT
$sin002 = 0.70710678118655;
$cos002 = -0.70710678118655;
$ata002 = atan2($sin002, $cos002);
$gra002 = rad2deg($ata002);

// THIRD QUADRANT
$sin003 = -0.70710678118655;
$cos003 = -0.70710678118655;
$ata003 = atan2($sin003, $cos003);
$gra003 = rad2deg($ata003);

// FOURTH QUADRANT
$sin004 = -0.70710678118655;
$cos004 = 0.70710678118655;
$ata004 = atan2($sin004, $cos004);
$gra004 = rad2deg($ata004);

?>

<table width="100%" border="1" cellspacing="5" cellpadding="5">
  <tr>
    <td colspan="4">FIRST QUADRANT </td>
  </tr>
  <tr>
   <td>sin</td>
   <td>cos</td>
   <td>radians</td>
   <td>degrees</td>
  </tr>
  <tr>
   <td><?php echo $sin001; ?></td>
   <td><?php echo $cos001; ?></td>
   <td><?php echo $ata001; ?></td>
   <td><?php echo $gra001; ?></td>
  </tr>
  <tr>
    <td colspan="4">SECOND QUADRANT </td>
  </tr>
  <tr>
   <td>sin</td>
   <td>cos</td>
   <td>radians</td>
   <td>degrees</td>
  </tr>
  <tr>
   <td><?php echo $sin002; ?></td>
   <td><?php echo $cos002; ?></td>
   <td><?php echo $ata002; ?></td>
   <td><?php echo $gra002; ?></td>
  </tr>
  <tr>
    <td colspan="4">THIRD QUADRANT </td>
  </tr>
  <tr>
   <td>sin</td>
   <td>cos</td>
   <td>radians</td>
   <td>degrees</td>
  </tr>
  <tr>
   <td><?php echo $sin003; ?></td>
   <td><?php echo $cos003; ?></td>
   <td><?php echo $ata003; ?></td>
   <td><?php echo $gra003; ?></td>
  </tr>

  <tr>
    <td colspan="4">FOURTH QUADRANT </td>
  </tr>
  <tr>
   <td>sin</td>
   <td>cos</td>
   <td>radians</td>
   <td>degrees</td>
  </tr>
  <tr>
   <td><?php echo $sin004; ?></td>
   <td><?php echo $cos004; ?></td>
   <td><?php echo $ata004; ?></td>
   <td><?php echo $gra004; ?></td>
  </tr>
  <tr>
    <td colspan="4">ed48</td>
  </tr>
</table>