document.write( "Question 1144157: sin(x/2)cos(x/2)(1-2sin^2(x/2)) \n" ); document.write( "
Algebra.Com's Answer #765165 by ikleyn(52867)\"\" \"About 
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document.write( "First,   sin(x/2)cos(x/2) = \"%281%2F2%29%2Asin%28x%29\".\r\n" );
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document.write( "Second,  1-2sin^2(x/2)  = cos(x).\r\n" );
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document.write( "Therefore,  sin(x/2)cos(x/2)(1-2sin^2(x/2)) = \"%281%2F2%29%2Asin%28x%29%2Acos%28x%29\" = \"%281%2F4%29%2Asin%282x%29\".    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "You need to know basic Trigonometry formulas for multiple arguments  (for double arguments,  in this case).\r
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