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\(\cos (\alpha + \beta ) = \cos \alpha \cos \beta - \sin \alpha \sin \beta \),令 \(\alpha = \beta = \theta \) \(\cos (\theta + \theta ) = \cos \theta \cos \theta - \sin \theta \sin \theta \) \( \Rightarrow \cos 2\theta = {\cos ^2}\theta - {\sin ^2}\theta \) \(\sin (\alpha + \beta ) = \sin \alpha \cos \beta + \cos \alpha \sin \beta \),令 \(\alpha = \beta = \theta \) \(\sin (\theta + \theta ) = \sin \theta \cos \theta + \cos \theta \sin \theta \) \( \Rightarrow \sin 2\theta = 2\sin \theta \cos \theta \) 故選(B) |
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