document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=436816>Question 436816</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use an addition or subtraction formula to find the solutions (in radians) of the equation that are in the interval [0, &#960;/2).<BR>\n" );
document.write( "cos(7t)(cos(t)=-sin(7t)sin(t)  \r<BR>\n" );
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document.write( "I started by: <BR>\n" );
document.write( "cos(7t)cos(t)+sint(7t)sin(t)=0 <BR>\n" );
document.write( "cos(7t-t)=0 <BR>\n" );
document.write( "cos(6t)=0 <BR>\n" );
document.write( "Where do I go from here? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #302159 by </B><A HREF=/tutors/aboutme.mpl?userid=shree840><B>shree840(260)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=shree840><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=shree840><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=302159\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos(6t)=0 so far okay<BR>\n" );
document.write( "cos90=0<BR>\n" );
document.write( "6t=90<BR>\n" );
document.write( "t=15 ANS </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );