document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1120454>Question 1120454</A>: <I><SPAN STYLE=\"word-break: break-all;\"> using double angle formula<BR>\n" );
document.write( "find all values of x such 0° < x < 360° for which\r<BR>\n" );
document.write( "\n" );
document.write( "a) 2cos 2x= 3-2 cos x<BR>\n" );
document.write( "giv ans to 0.1\r<BR>\n" );
document.write( "\n" );
document.write( "plz help it's confusing\r<BR>\n" );
document.write( "\n" );
document.write( "thx  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #736172 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=736172\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "You have three basic identities for cos(2x).  Since the rest of the equation contains a term involving cos(x), use the identity for cos(2x) that contains only cos(x).  That will give you a quadratic equation in cos(x).<br><BR>\n" );
document.write( "The equation won't factor; you will need to use the quadratic formula or something like a graphing calculator to find the value(s) of cos(x) that satisfy the equation.<br><BR>\n" );
document.write( "If you use a graphing calculator, you will get the solutions for x.  If you use the quadratic formula, what you will get is values of cos(x); then of course to find the values of x you will need to use the inverse cosine function. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );