document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=181072>Question 181072</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Show how they equal.<BR>\n" );
document.write( "cos 90 degrees= square root 1 + cos 180 degrees/ 2<BR>\n" );
document.write( "PLEASE HELP ME OUT\r<BR>\n" );
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document.write( " </SPAN>\n" );
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document.write( "cos90=0<BR>\n" );
document.write( "cos180=-1\r<BR>\n" );
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document.write( "cos90= sqr(1 + cos180)/2<BR>\n" );
document.write( "0 = sqr (1 + (-1))/2<BR>\n" );
document.write( "0 = sqr (0)/2<BR>\n" );
document.write( "0= 0/2<BR>\n" );
document.write( "0=0 </SPAN>\n" );
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