esc'><h4>function arctan2(y,x : real) : real;</h4><br>
	arctan2 calculates arctan(y/x), and returns an angle in the correct quadrant. The returned angle will be in the range $-\pi$ to $\pi$ radians.<br><ul></ul></td></tr>
<tr><td class='tname fname'>ArcSin</td><td class='tdesc'><h4>function ArcSin(x: real): real;</h4><br>
	Arcsin returns the inverse sine of its argument x. The argument x should lie between -1 and 1.<br><ul></ul></td></tr>
<tr><td class='tname fname'>ArcCos</td><td class='tdesc'><h4>function