document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=824976>Question 824976</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If sin 0 = 4/5, what is the value of cos 0 in quadrant 1?\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 #496904 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=496904\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If sin(theta) = 4/5, what is the value of cos(theta) in quadrant 1? \r<BR>\n" );
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document.write( "sin^2(theta) + cos^2(theta) = 1\r<BR>\n" );
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document.write( "(4/5)^2 + cos^2(theta) = 1\r<BR>\n" );
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document.write( "16/25 + cos^2(theta) = 1\r<BR>\n" );
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document.write( "cos^2(theta) = 1 - 16/25\r<BR>\n" );
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document.write( "cos^2(theta) = 25/25 - 16/25\r<BR>\n" );
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document.write( "cos^2(theta) = (25 - 16)25\r<BR>\n" );
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document.write( "cos^2(theta) = 9/25\r<BR>\n" );
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document.write( "cos(theta) = sqrt(9/25) ... we are in quadrant I, so cos(theta) > 0\r<BR>\n" );
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document.write( "cos(theta) = 3/5 </SPAN>\n" );
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