document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=751959>Question 751959</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Verify: sin^4 (x)-cos^4 (x)=(2sin^2(x))-1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #457489 by </B><A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><B>tommyt3rd(5050)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><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/cgi-bin/show-face.mpl?user=tommyt3rd><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=457489\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%0D%0Asin%5E4+%28x%29-cos%5E4+%28x%29=%28sin%5E2+%28x%29-cos%5E2+%28x%29%29%28sin%5E2+%28x%29%2Bcos%5E2+%28x%29%29=%28sin%5E2+%28x%29-cos%5E2+%28x%29%29%281%29%0D%0A ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "and then\r<BR>\n" );
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document.write( ":) </SPAN>\n" );
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