document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=56419>Question 56419</A>: <I><SPAN STYLE=\"word-break: break-all;\"> cos 225 as function of a positve acute angle less than 45.\r<BR>\n" );
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document.write( "The reference angel of cos 225 is -cos 45 but that is not less than 45 nor is it positve. </SPAN>\n" );
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document.write( "The reference angel of cos 225 is -cos 45 but that is not less than 45 nor is it positve.<BR>\n" );
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document.write( "The reference angle for 225 degrees is 225-180 or 45 degrees.<BR>\n" );
document.write( "But the cos 225 is negative.<BR>\n" );
document.write( "So you use the positive reference angle to find cos 45, then<BR>\n" );
document.write( "you put a negative on the result because cos225 is negative.<BR>\n" );
document.write( "So cos225 = -cos45 = -(sqrt2)/2 or -1/sqrt2<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H </SPAN>\n" );
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