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Question Number 156065 by VIDDD last updated on 07/Oct/21

$$\mathrm{find}\mathrm{the}\mathrm{minimum}\mathrm{of}\mathrm{expression}\mathrm{M}=\mathbf{cos}\frac{\mathbf{A}-\mathbf{B}}{2}\sin \frac{\mathbf{A}}{2}\sin \frac{\mathbf{B}}{2}$$

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