document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=848736>Question 848736</A>: <I><SPAN STYLE=\"word-break: break-all;\"> it says 2 cos^2 30*(thirty is an angle) -1\r<BR>\n" );
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document.write( "it says Simplify to a single trig function, and then find the exact radical value to each expression below.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #511258 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=511258\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2 cos^2 30*(thirty is an angle) -1 <BR>\n" );
document.write( "it says Simplify to a single trig function, and then find the exact radical value to each expression below.<BR>\n" );
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document.write( "Note: cos(30+30) = cos30*cos30 - sin30*sin30 = cos^2(30) - sin^2(30)<BR>\n" );
document.write( "= cos^2(30) - (1-cos^2(30) = 2cos^2(30) - 1<BR>\n" );
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document.write( "So, 2cos^2(30)-1 = cos(60) = 1/2<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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