d/dx (cos x)^2 using the rule of chain, take derivative of the external, times derivative of the internal
= 2 (cos x)(-sin x)
=-2sinx cos x = - sin(2x)
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2 x cosine squared x -1 which also equals cos (2x)
(X2) (X2) = X4 x squared multiplied by x squared is x raised to the 4th power.
Sin squared, cos squared...you removed the x in the equation.
If you mean a2 x a2... the answer is a4
X = √63