document.write( "Question 1032966: Use the sum or difference identities to find the exact value of the trigonometric function.
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Algebra.Com's Answer #647589 by ikleyn(52798) $\"\"$ $\"About$

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\n" ); document.write( "Use the sum or difference identities to find the exact value of the trigonometric function.
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document.write( " =  =  = -tan(15°) = .\r\n" );
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document.write( "sin(15°) =  =   (formula of half argument for sine, see the lesson  Trigonometric functions of half argument  in this site)\r\n" );
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document.write( "=  =  = .\r\n" );
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document.write( "cos(15°) =  =   (formula of half argument for sine, see the lesson  Trigonometric functions of half argument  in this site)\r\n" );
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document.write( "=  =  = .\r\n" );
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document.write( "Therefore,  tan(15°) = .\r\n" );
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document.write( "You can rationalize the denominator in the last expression by multiplying the numerator and the denominator by . You will get \r\n" );
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document.write( "tan(15°) =  =  =  = .\r\n" );
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document.write( "Finally,   =  =  =   (negative value).\r\n" );
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document.write( "It is your answer. The problem is solved.\r\n" );
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document.write( "See also the lesson  Trigonometric functions of half argument - Examples,  Example 2. \r\n" );
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