Hard to explain what I mean but typically is: $\displaystyle \cos(4x^2+2)^4 = (\cos(4x^2+2))^4$ Or: $\displaystyle \cos(4x^2+2)^4 = \cos( (4x^2+2)^4) $
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The second is most correct. Also consider $\displaystyle (\cos(4x^2+2))^4 =\cos^4(4x^2+2)$
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