document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=820363>Question 820363</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find cosine theta, if sine theta = -2/5 in quadrant 3 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #493480 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=493480\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find cosine theta, if sine theta = -2/5 in quadrant 3<BR>\n" );
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document.write( "In QIII x and y are both negative.<BR>\n" );
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document.write( "Since sine = y/r, y = -2 and r = 5<BR>\n" );
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document.write( "Then x = sqrt[2^2+5^2] = sqrt[29]<BR>\n" );
document.write( "So, x = -sqrt(29)<BR>\n" );
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document.write( "Ans: cos(theta) = x/r = -sqrt(29)/5<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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