document.write( "Question 175822: verify the identity cosx/1+sinx + cosx/1-sin x=2secx \n" ); document.write( "

Algebra.Com's Answer #130966 by Alan3354(69443) $\"\"$ $\"About$

You can put this solution on YOUR website!
verify the identity cosx/1+sinx + cosx/1-sin x=2secx
\n" ); document.write( "cosx/1+sinx + cosx/1-sin x=2secx
\n" ); document.write( "Multiply by (1-sin^2)
\n" ); document.write( "cos*(1-sin) + cos*(1+sin) = 2sec*(1-sin^2)
\n" ); document.write( "2cos = 2sec(1-sin^2)
\n" ); document.write( "cos = sec - sec*sin^2
\n" ); document.write( "Multiply by cos
\n" ); document.write( "cos^2 = 1 - sin^2
\n" ); document.write( "sin^2 + cos^2 = 1
\n" ); document.write( "That's proof for me. \n" ); document.write( "

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