document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1031264>Question 1031264</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Jenny needs to find sin2x, and she knows that 0 < x < &#960;. She also knows that sin2x and cosx are 7/25 and 24/25, but she doesn't know which is which.<BR>\n" );
document.write( "a) why isn't it necessary for her to distinguish between the two?<BR>\n" );
document.write( "b) Find the value of sin2x for both cases </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #646057 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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/cgi-bin/show-face.mpl?user=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=646057\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Do you mean sin 2x, or sin^2 x?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Also, if cos x = 24/25, then sin x = 7/25 (since 0 < x < pi, so sin x is positive, and using the fact that sin^2 x + cos^2 x = 1), and it is impossible for sin 2x or sin^2 x to also equal 7/25. Same thing if cos x = 7/25. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );