document.write( "Question 1204959: Use identities to write the expression as a function of x.\r
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Algebra.Com's Answer #841516 by ikleyn(52908) $\"\"$ $\"About$

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\n" ); document.write( "Use identities to write the expression as a function of x.
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document.write( "Use trigonometric identity - the addition formula for tangents\r\n" );
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document.write( "    tan(a+b) = .    (1)\r\n" );
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document.write( "It gives\r\n" );
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document.write( "     = .    (2)\r\n" );
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document.write( "Next, use the formula of half-angle for tangents to express  \r\n" );
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document.write( "     =  =  =  =  = .    (3)\r\n" );
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document.write( "Continue (2)\r\n" );
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document.write( "     =  =  = .\r\n" );
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document.write( "ANSWER.    simplified is  .\r\n" );
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