document.write( "Question 1067701: Can somebody help me by writing 4 cos 2θ sin 4θ as a sum or difference? Ty. \n" ); document.write( "

Algebra.Com's Answer #682841 by ikleyn(52794) $\"\"$ $\"About$

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\n" ); document.write( "Can somebody help me by writing 4*cos(2*theta)*sin(4*theta) as a sum or difference? Ty.
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document.write( "There is a general formula of Trigonometry\r\n" );
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document.write( "See any serious textbook in Trigonometry or the lessons\r\n" );
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document.write( "    - FORMULAS FOR TRIGONOMETRIC FUNCTIONS\r\n" );
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document.write( "    - Product of trigonometric functions\r\n" );
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document.write( "in this site. \r\n" );
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document.write( "This formula is FUNDAMENTAL, which means \"everybody must know it\".\r\n" );
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document.write( "According to this formula,\r\n" );
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document.write( " =  = .\r\n" );
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\n" ); document.write( "\n" ); document.write( "Answer. $\"4%2Acos%282%2Atheta%29%2Asin%284%2Atheta%29\"$ = $\"2%2Asin%282%2Atheta%29+%2B+2%2Asin%286%2Atheta%29\"$ .\r
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