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Math Help - half angle formula

  1. #1
    Junior Member
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    Exclamation half angle formula

    simplify

    -cos2xsin4x / 1+cos4x
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  2. #2
    Member Nacho's Avatar
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    <br />
\frac{{\cos (2x)\sin (4x)}}<br />
{{1 + \cos (4x)}} = \frac{{\cos 2x \cdot \left( {2\sin (2x)\cos (2x)} \right)}}<br />
{{\sin ^2 (2x) + \cos ^2 (2x) + \cos ^2 (2x) - \sin ^2 (2x)}}<br />
<br />
 = \frac{{2\cos ^2 (2x) \cdot \sin (2x)}}<br />
{{2\cos ^2 (2x)}} = \sin (2x)<br />
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  3. #3
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    thank you
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