document.write( "Question 1144209: evaluate cos(2theta - pi/2)\r
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Algebra.Com's Answer #765306 by AnlytcPhil(1806)\"\" \"About 
You can put this solution on YOUR website!
\"cos%282theta+-+pi%2F2%29\"\r\n" );
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document.write( "Use these identities:\r\n" );
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document.write( "\"cos%28alpha-beta%29=cos%28alpha%29cos%28beta%29%2Bsin%28alpha%29sin%28beta%29\"\r\n" );
document.write( "\"sin%282alpha%29=2sin%28alpha%29cos%28alpha%29\"\r\n" );
document.write( "\"cos%28pi%2F2%29=0\"\r\n" );
document.write( "\"sin%28pi%2F2%29=1\"\r\n" );
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document.write( "Edwin
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