document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=754199>Question 754199</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Using double angle formula find the exact value, given sec&#952;=4,3pi/2<&#952;<2pi \r<BR>\n" );
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document.write( "sin2&#952;=\r<BR>\n" );
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document.write( "cos2&#952;=\r<BR>\n" );
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document.write( "tan2&#952;=\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #458871 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=458871\">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=sec%28theta%29=4 ALIGN=MIDDLE  ALT=\"sec%28theta%29=4\"   DISABLED_style= \"max-width:90%; height:auto;\" >, \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3pi%2F2%3Ctheta%3C2pi ALIGN=MIDDLE  ALT=\"3pi%2F2%3Ctheta%3C2pi\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "i.e. we are in quadrant IV\r<BR>\n" );
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document.write( "means...\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28theta%29=-sqrt%2815%29%2F4 ALIGN=MIDDLE  ALT=\"sin%28theta%29=-sqrt%2815%29%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin2%2Atheta=+2sin%28theta%29cos%28theta%29=2%28-sqrt%2815%29%2F4%29%281%2F4%29=-sqrt%2815%29%2F8 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos2%2Atheta=2cos%5E2%28theta%29-1=2%281%2F4%29-1=-1%2F2 ALIGN=MIDDLE  ALT=\"cos2%2Atheta=2cos%5E2%28theta%29-1=2%281%2F4%29-1=-1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "We forgo using tangent identities since we don't need them\r<BR>\n" );
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