PHP trigonometry TAN
<p>I try to figure out an angle of a triangle.</p>

<p>If one side of the triangle is 100 and the other side is 100.</p>

<p>How do I get that to be 45 degrees.</p>

<p>If I run tan<sup>-1</sup>(100/100) on my calculator i get 45. How do I do this in PHP?</p>
