document.write( "Question 1036429: Prove that
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Algebra.Com's Answer #651088 by Alan3354(69443)\"\" \"About 
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(1-sin^2A)/(1+cosA) = cosA
\n" ); document.write( "cos^2/(1+cos) = cos
\n" ); document.write( "cos^2 = cos + cos^2
\n" ); document.write( "Not an identity.
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\n" ); document.write( "It's ambiguous. Add parentheses to clarify.
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