Posted by larry on Tuesday, November 13, 2007 at 11:08am.
By radical 3 do you mean the cube root of (3 cos2x+sin2x) ?
Do you mean cos^2 x and sin^2 x or cos (2x) and sin (2x)?
The cube root will be zero if and only if 3cos2x+sin2x is also zero. Put in 15 degrees for x and see what you get.
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