document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=519724>Question 519724</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove the following is an identity \r<BR>\n" );
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document.write( "(5 cos E - 2 sin E)^2 + (2 cos E + 5 sin E)^2 =29 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #346478 by </B><A HREF=/tutors/aboutme.mpl?userid=Aswathy><B>Aswathy(23)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Aswathy><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=346478\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> First before checking out the answer just check out the RHS side of your question.\r<BR>\n" );
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document.write( "LHS=(5cos E - 2sin E)^2 + (2cos E +5 sin E)^2 <BR>\n" );
document.write( "   =25cos^2E-20cosEsinE + 4sin^2E + 4cos^2E +20cosEsinE+25sin^2E<BR>\n" );
document.write( "   =1+0+1 (using identity cos^2E+sin^2E=1)<BR>\n" );
document.write( "   =2<BR>\n" );
document.write( "   =RHS </SPAN>\n" );
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