document.write( "Question 1157401: Prove the identity.
\n" ); document.write( "5tan(3x) = (15tan(x) − 5tan^3(x))/ (1 − 3tan^2(x)) \n" ); document.write( "

Algebra.Com's Answer #780429 by Edwin McCravy(20055) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "We will work only with the left side.  We will use this formulas:\r\n" );
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document.write( "               and its corollary:\r\n" );
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document.write( "Distribute the 5 to remove parentheses on the top and\r\n" );
document.write( "multiply tangents on the bottom:\r\n" );
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document.write( "Distribute to remove the parentheses:\r\n" );
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document.write( "Combine terms:\r\n" );
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document.write( "Edwin

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