document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=673994>Question 673994</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve these Trigonometric Addition Formulas: \r<BR>\n" );
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document.write( "cos2xcos3x+sin2xsin3x <BR>\n" );
document.write( "sin5xcosx-cos5xsinx  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #419315 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=419315\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos2xcos3x+sin2xsin3x<BR>\n" );
document.write( "Identity: cos(s-t)=cos s cos t+sins sin t<BR>\n" );
document.write( "cos2xcos3x+sin2xsin3x<BR>\n" );
document.write( "=cos(2x-3x)<BR>\n" );
document.write( "=cos(-x)<BR>\n" );
document.write( "=cosx (cos is an even function)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "sin5xcosx-cos5xsinx<BR>\n" );
document.write( "Identity: sin(s-t)=sin s cos t-cos s sin t<BR>\n" );
document.write( "sin5xcosx-cos5xsinx<BR>\n" );
document.write( "=sin(5x-x)<BR>\n" );
document.write( "=sin (4x) </SPAN>\n" );
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