document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=900902>Question 900902</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If sine of theta equals -2/3 with theta in quadrant IV, what is cosine of theta? \r<BR>\n" );
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document.write( "So.. y=-2/3 what does X=? <BR>\n" );
document.write( "Is it just Pythagorean identity? <BR>\n" );
document.write( "Like cosine of theta squared + sine of theta squared = 1 <BR>\n" );
document.write( "And solve for cosine of theta ?<BR>\n" );
document.write( "im not sure if im doing this right.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #546284 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=546284\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If sine of theta equals -2/3 with theta in quadrant IV, what is cosine of theta?<BR>\n" );
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document.write( "By definition, sin = y/r<BR>\n" );
document.write( "So, y = -2 and r = 3<BR>\n" );
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document.write( "Then x = sqrt[r^2-y^2] = sqrt[9-4] = sqrt(5)<BR>\n" );
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document.write( "Ans: cos = x/r = sqrt(5)/3<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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