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limθ→0(cosθ−sinθ×cosθ)(cosθ+sinθ×cosθ)= ? \lim_{\theta \to 0} {(\cos \theta -\sin \theta \times \cos \theta)(\cos \theta + \sin \theta \times \cos \theta)} = \ ?θ→0lim(cosθ−sinθ×cosθ)(cosθ+sinθ×cosθ)= ?
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