document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=954175>Question 954175</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if sin of theta is -2/7, and if tan>0, what is the cos of theta? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #582755 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=582755\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if sin of theta is -2/7, and if tan>0, what is the cos of theta?<BR>\n" );
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document.write( "use x for theta<BR>\n" );
document.write( "reference angle theta is in quadrant III where sin<0, cos<0<BR>\n" );
document.write( "sinx=-2/7<BR>\n" );
document.write( "cosx=-&#8730;(1-sin^2(x))=-&#8730;(1-4/49)=-&#8730;(45/49)=-&#8730;45/7<BR>\n" );
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