document.write( "Question 1144154: sin(x)/2cos(X)/2(1-2sin^2(x)/2)
\n" ); document.write( "The answer in my book is 1/4 sin(2x)
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Algebra.Com's Answer #765167 by ikleyn(52811) $\"\"$ $\"About$

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document.write( "First,   sin(x/2)cos(x/2) = .\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)) =  = .    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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