<PRE><B>Question 167562</B>
&lt;pre&gt;&lt;font size = 4 color = &quot;indigo&quot;&gt;&lt;b&gt;

If in radians,

{{{-pi/2&lt;=x&lt;=pi/2}}}

If in degrees,

{{{-90&lt;=x&lt;=90}}}°

Edwin&lt;/pre&gt;
</PRE>