document.write( "Question 602435: Hi. How do I prove that this is an identity?? I really don't get how this works...\r
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\n" ); document.write( "\n" ); document.write( "(1-3cosTheta - 4cos^2 Theta)/ sin^2 Theta = (1-4cosTheta)/1-cosTheta
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\n" ); document.write( "\n" ); document.write( "Oh, and if you can, please explain how you arrived at the answer as well. I really don't get how our teacher explains this, you see. Thanks a bunch to those who answer! \n" ); document.write( "

Algebra.Com's Answer #380239 by AnlytcPhil(1807) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "The trick is that if you see any of these:\r\n" );
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document.write( ", , , , you can change them to either  or ,\r\n" );
document.write( "which are identities for  or  respectively, by multiplying and\r\n" );
document.write( "dividing by the conjugate.  There is one of these on the bottom of the right\r\n" );
document.write( "side, so start with the right side and do just that:\r\n" );
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document.write( " = \r\n" );
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document.write( "               = \r\n" );
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document.write( "               = \r\n" );
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document.write( "               = \r\n" );
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document.write( "Edwin

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