document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=797527>Question 797527</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this equation: If cos(a)=8/17 and 270° < a < 360°, then sin(a) equals?\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 #481867 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=481867\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If cos(a)=8/17 and 270° < a < 360°, then sin(a) equals?<BR>\n" );
document.write( "reference angle (a) is in quadrant IV where cos>0 and sin<0<BR>\n" );
document.write( "sin(a)=-&#8730;(1-cos^2(a))=-&#8730;(1-(8/17)^2)=-&#8730;(1-(64/289)=-&#8730;(225/289)=-15/17 <BR>\n" );
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