document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=851076>Question 851076</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Is an acute angle and sin 0 is given. Use the Pythagorean identity <BR>\n" );
document.write( "sin^2 + cos^2=1 find cos 0\r<BR>\n" );
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document.write( "(a) sin 0= (6/7)\r<BR>\n" );
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document.write( "(b)sin 0= (sqrt(21))/5\r<BR>\n" );
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document.write( " Show work please!<BR>\n" );
document.write( "I really need it! Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #512548 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=512548\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Is an acute angle and sin 0 is given. Use the Pythagorean identity <BR>\n" );
document.write( "sin^2 + cos^2=1 find cos 0 <BR>\n" );
document.write( "(a) sin 0= (6/7)<BR>\n" );
document.write( "(6/7)^2 + cos^2(t) = 1<BR>\n" );
document.write( "cos^2(t) = 1-(36/49)<BR>\n" );
document.write( "cos^2(t) = 13/49 <BR>\n" );
document.write( "cos(t) = +/- sqrt(13)/7<BR>\n" );
document.write( "===============================\r<BR>\n" );
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document.write( "(b)sin 0= (sqrt(21))/5<BR>\n" );
document.write( "(21/5)^2 + cos^2(t) = 1<BR>\n" );
document.write( "cos^2(t) = 1 - 21/25 = 4/25<BR>\n" );
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document.write( "cos(t) = +/- 2/5<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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