document.write( "Question 889599: Sin(x).tan(x)/cos(x) + 1 = 1/cos^2(x)\r
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Algebra.Com's Answer #538279 by Alan3354(69443)\"\" \"About 
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Sin(x).tan(x)/cos(x) + 1 = 1/cos^2(x)\r
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\n" ); document.write( "Sin(x)*tan(x)/cos(x) + 1 = 1/cos^2(x)
\n" ); document.write( "Sin^2(x)/cos^2(x) + 1 = 1/cos^2(x)
\n" ); document.write( "tan^2 + 1 = sec^2
\n" ); document.write( "QED
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