document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=697819>Question 697819</A>: <I><SPAN STYLE=\"word-break: break-all;\"> using trigonometric fundamental identities prove that sina/(1+cosa)+(1+cosa)/sina=2csca </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #430292 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=430292\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> using trigonometric fundamental identities prove that sina/(1+cosa)+(1+cosa)/sina=2csca<BR>\n" );
document.write( "**<BR>\n" );
document.write( "sin/(1+cos)+(1+cos)/sin=2csc<BR>\n" );
document.write( "start with left side:<BR>\n" );
document.write( "sin/(1+cos)+(1+cos)/sin<BR>\n" );
document.write( "sin^2+(1+cos)^2)/sin(1+cos)<BR>\n" );
document.write( "(sin^2+1+2cos+cos^2)/sin(1+cos)<BR>\n" );
document.write( "(1+1+2cos)/sin(1+cos)<BR>\n" );
document.write( "(2+2cos)/sin(1+cos)<BR>\n" );
document.write( "2(1+cos)/sin(1+cos)<BR>\n" );
document.write( "2/sin<BR>\n" );
document.write( "2csc<BR>\n" );
document.write( "verified: left side=right side </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );