document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=699789>Question 699789</A>: <I><SPAN STYLE=\"word-break: break-all;\"> establish each identity \r<BR>\n" );
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document.write( "A)   1 - sin theta over cos theta + cos theta over 1 - sin theta = 2 sec theta </SPAN>\n" );
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document.write( "A) 1 - sin theta over cos theta + cos theta over 1 - sin theta = 2 sec theta<BR>\n" );
document.write( "**<BR>\n" );
document.write( "start with left side<BR>\n" );
document.write( "(1-sin)/cos+cos/(1-sin)<BR>\n" );
document.write( "=(1-sin)^2+cos^2/cos(1-sin)<BR>\n" );
document.write( "=1-2sin+sin^2+cos^2/cos(1-sin)<BR>\n" );
document.write( "=2-2sin/cos(1-sin)=2(1-sin)/cos(1-sin)=2/cos=2 sec<BR>\n" );
document.write( "verified: left side=right side </SPAN>\n" );
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