document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=993106>Question 993106</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the derivative of the function.<BR>\n" );
document.write( "y = a^4 + cos^4 x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #612487 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52856)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=612487\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "Find the derivative of the function y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%5E4+%2B+cos%5E4%28x%29 ALIGN=MIDDLE  ALT=\"a%5E4+%2B+cos%5E4%28x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "-------------------------------------------------------------------\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "As I understand, a is a constant, independent of x. Then\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "y' = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2Acos%5E3%28x%29%2A%28-sin%28x%29%29 ALIGN=MIDDLE  ALT=\"4%2Acos%5E3%28x%29%2A%28-sin%28x%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28-4%29%2Acos%5E3%28x%29%2Asin%28x%29 ALIGN=MIDDLE  ALT=\"%28-4%29%2Acos%5E3%28x%29%2Asin%28x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );