Constructing Trigonometric Tables Using WHILE Loops - PHP

Have you ever thought of constructing trigonometric tables? To construct a table for an angle starting from 0 degrees and continuing to 360 degrees using three basic trigonometric functions and their inverses (with $x as the variable):

sin(deg2rad($x))

cos(deg2rad($x))

tan(deg2rad($x))

You will need to iterate going from 0 degrees to 360 degrees using a WHILE loop. You will need to convert $x to radians, since by default trigonometric functions evaluate angles as radians. You can accomplish this using the function:

Deg2rad();

Below is the complete script required to generate the trigonometric table for the three functions (sine, cosine and tangent) and well as their inverses (cotangent, secant, and cosecant)

<?php

echo '<table width=100% border=1>';

echo '<tr><td><b>Angle in Degrees</b></td><td><b>Sine</b></td><td><b>Cosine</b></td>
<td><b>Tangent</b></td><td><b>Cotangent</b></td>
<td><b>Secant</b></td><td><b>Cosecant</b></td></tr>';

$i=1;

while ($i<=360) {

$x=$i++;

echo '<tr>';

echo '<td>'.$x.'</td>';

echo '<td>'.sin(deg2rad($x)).'</td>';

echo '<td>'.cos(deg2rad($x)).'</td>';

echo '<td>'.tan(deg2rad($x)).'</td>';

echo '<td>'.(1/tan(deg2rad($x))).'</td>';

echo '<td>'.(1/cos(deg2rad($x))).'</td>';

echo '<td>'.(1/sin(deg2rad($x))).'</td>';

echo '</tr>';

}

echo '</table>';

?>

The screen shot below is the trigonometric table when viewed in a browser: 

You can also extend the above application not only to trigonometry but to other important engineering tables like logarithmic tables, steam tables, etc.