document.write( "Question 1117224: cos 2 theta cos 2 fi + sin^2(theta + fi) - sin^2( theta + fi)= cos(2 theta + 2 fi) \n" ); document.write( "
Algebra.Com's Answer #732316 by Alan3354(69443)\"\" \"About 
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cos 2 theta cos 2 fi + sin^2(theta + fi) - sin^2( theta + fi)= cos(2 theta + 2 fi)
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