document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=925535>Question 925535</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Is this correct? simplifying cosine and sine equation?<BR>\n" );
document.write( "(a) Simplify: 20 sin 2&#952; cos 2&#952; =\r<BR>\n" );
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document.write( "20sin2(4&#952;) or is it 20sin(8&#952;)?\r<BR>\n" );
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document.write( "(b) Simplify and then find the value:<BR>\n" );
document.write( "sin 13&#960;/12 cos 13&#960;/12=\r<BR>\n" );
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document.write( "What should I do here?\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 #562028 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=562028\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (a) Simplify: 20 sin 2&#952; cos 2&#952; = <BR>\n" );
document.write( "20sin2(4&#952;) or is it 20sin(8&#952;)? <BR>\n" );
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document.write( "since sin(2t) = 2sin(t)cos(t)<BR>\n" );
document.write( "20*sin(2t)cos(2t) = 10*(2sin(2t)cos(2t)) = 10*sin(2(2t)) = 10sin(4t)<BR>\n" );
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document.write( "(b) Simplify and then find the value:<BR>\n" );
document.write( " sin 13&#960;/12 cos 13&#960;/12=  (1/2)sin(2(13pi/12) = (1/2)sin(13pi/6)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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