SIN A COS B：二倍角公式及其推导过程 - CSDN博客

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Merek : sin a cos b

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sin a cos b juventus frosinone 以下是推导过程：sin⁡2θ=2sin⁡θcos⁡θ\sin2\theta=2\sin\theta\cos\thetasin2θ=2sinθcosθ推导：根据和角公式sin⁡a+b=sin⁡acos⁡b+cos⁡asin⁡b\sina+b=\sin a\cos b+\cos a\sin bsina+b=sinacosb+cosasinb，令a=b=θa=b=\thetaa=b=θ，得：sin⁡2θ

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