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Write the product cos(2x)sin(5x) as a sum

User Joram
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come on now, check your book on the "product to sum" identities


\bf cos({{ \alpha}})sin({{ \beta}})=\cfrac{1}{2}[sin({{ \alpha}}+{{ \beta}})\quad -\quad sin({{ \alpha}}-{{ \beta}})]
User Myriam
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