document.write( "Question 916445: Prove that Cos^2 x(1-sec^2 x) = -sin^2 x
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Algebra.Com's Answer #556064 by mananth(16946)\"\" \"About 
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Cos^2 x(1-sec^2 x) = -sin^2 x\r
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\n" ); document.write( "\n" ); document.write( "Cos^2 x(Sec^2x-tan^2x-sec^2 x) = -sin^2 x\r
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\n" ); document.write( "\n" ); document.write( "cos^2x * -tan^2x\r
\n" ); document.write( "\n" ); document.write( "cos^2x *-sin^2x/cos^2x\r
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