document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=604252>Question 604252</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you prove that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%285x%29+=+5+cos%28x%29+-+20+cos%5E3%28x%29+%2B+16+cos%5E5%28x%29 ALIGN=MIDDLE  ALT=\"cos%285x%29+=+5+cos%28x%29+-+20+cos%5E3%28x%29+%2B+16+cos%5E5%28x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > using sum and difference identities? Thank you :D\r<BR>\n" );
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document.write( "*EDIT: I'm so sorry, cos^5 x should be cos 5x </SPAN>\n" );
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