document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=970293>Question 970293</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the equation for exact values: 2cos^2(x) - 2sin^2(x) + 2 = 0<BR>\n" );
document.write( "Select one:<BR>\n" );
document.write( "a. &#960;<BR>\n" );
document.write( "b. 0<BR>\n" );
document.write( "c. &#960;/2<BR>\n" );
document.write( "d. 2&#960;<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #592951 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=592951\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2cos^2(x) - 2sin^2(x) + 2 = 0<BR>\n" );
document.write( "cos^2(x) - sin^2(x) + 1 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "cos^2 + sin^2 = 1<BR>\n" );
document.write( "----<BR>\n" );
document.write( "cos^2(x) - sin^2(x) + cos^2(x) + sin^2(x) = 0<BR>\n" );
document.write( "2cos^2(x) = 0<BR>\n" );
document.write( "cos(x) = 0<BR>\n" );
document.write( "x = pi/2 ± n*pi, n = 0,1,2,3... </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );