document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1031119>Question 1031119</A>: <I><SPAN STYLE=\"word-break: break-all;\"> sen(a)= 8/17, 0 < a < &#960;/2 and cos(B) = 3/5, 0 < B < &#960;/2, cos (a+b)= ??? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #645839 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=645839\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sin(a)= 8/17, 0 < a < &#960;/2 and cos(B) = 3/5, 0 < B < &#960;/2,<BR>\n" );
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document.write( "cos(a) = sqrt[17^2-8^2]/17 and sin(B) = sqrt[5^2-3^2]/5<BR>\n" );
document.write( " cos (a+b)= cos(a)*cos(b)-sin(a)sin(b)<BR>\n" );
document.write( "= (15/17)(3/5) - (8/17)(4/5)<BR>\n" );
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document.write( "= 45/85 - 32/85<BR>\n" );
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document.write( "= 13/85<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" );
document.write( "</TD></TR></TABLE>\n" );