document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=643072>Question 643072</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please help me with this problem?<BR>\n" );
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document.write( "Evaluate the indicated function. <BR>\n" );
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document.write( "Find the value of sin (&#945;/2) if cos &#945; = 20/21 and (0DEG < &#945; < 90DEG).<BR>\n" );
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document.write( "sin(&#945;/2)= __?__\r<BR>\n" );
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document.write( "Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #404360 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=404360\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the value of sin (&#945;/2) if cos &#945; = 20/21 and (0DEG < &#945; < 90DEG)\r<BR>\n" );
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document.write( "Identity: sin (&#945;/2)=&#8730;[(1-cos &#945;)/2]<BR>\n" );
document.write( "=&#8730;[(1-20/21)/2]<BR>\n" );
document.write( "=&#8730;[(21/21-20/21)/2]<BR>\n" );
document.write( "=&#8730;[(1/21)/2]<BR>\n" );
document.write( "=&#8730;(1/42)<BR>\n" );
document.write( "sin(&#945;/2)=&#8730;(1/42)<BR>\n" );
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