document.write( "Question 1171121: Express (sin 3x sin x) as a sum. \n" ); document.write( "

Algebra.Com's Answer #796021 by ikleyn(53812) $\"\"$ $\"About$

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document.write( "Use one of the basic Trigonometry formulas for the product of sine functions\r\n" );
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document.write( "     = .\r\n" );
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document.write( "In your case  a = 3x;  b = x;  therefore\r\n" );
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document.write( "    sin(3x)*sin(x) =  =  - ,\r\n" );
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document.write( "exactly as requested.\r\n" );
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