document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=384769>Question 384769</A>: <I><SPAN STYLE=\"word-break: break-all;\"> z=r(cos theta + i sin theta) show:<BR>\n" );
document.write( "a) {z}=r<BR>\n" );
document.write( "b) 1/z = 1/r(cos theta - i sin theta) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #272380 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=272380\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  z=r(cos theta + i sin theta) show:<BR>\n" );
document.write( "a) {z}=r<BR>\n" );
document.write( "z = r(cos^2+sin^2)<BR>\n" );
document.write( "= r*1<BR>\n" );
document.write( "= r<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "b) 1/z = 1/r(cos theta - i sin theta)<BR>\n" );
document.write( "That is an identity if z = r(cis(theta))<BR>\n" );
document.write( "---<BR>\n" );
document.write( "What are you expected to show?<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );