File r37/lisp/csl/html/r37_0244.html artifact 72fa3cd9e2 part of check-in 3c4d7b69af

<A NAME=ASIN>

<TITLE>ASIN</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>ASIN</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
 <P>
<P>
The <em>asin</em> operator returns the arcsine of its argument. 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>asin</em>(&lt;expression&gt;) or <em>asin</em> &lt;simple\_expression&gt; 
<P>
<P>
<P>
&lt;expression&gt; may be any scalar REDUCE expression, not an array, matrix or 

vector expression. &lt;simple\_expression&gt; must be a single identifier or 
begin with a prefix operator name. 
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
asin(givenangle); 

  ASIN(GIVENANGLE) 


asin(5); 

  ASIN(5) 


df(asin(2*x),x); 

                 2
    2*SQRT( - 4*X  + 1))
  - -------------------- 
             2
          4*X  - 1


on rounded; 

asin .5; 

  0.523598775598 


asin(sqrt(3)); 

  ASIN(1.73205080757) 


asin(sqrt(3)/2); 

  1.04719755120 

</TT></PRE><P>A numeric value is not returned by <em>asin</em> unless the switch
 
<em>rounded</em> is on and its argument has an absolute value less than or 
equal to 1. 
<P>
<P>
<P>