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OpenStudy (anonymous):
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OpenStudy (anonymous):
OpenStudy (zepp):
Use the product to sum formula, which is \[\large \sin\alpha\cos\beta=\frac{1}{2}(\sin(\alpha+\beta)+\sin(\alpha-\beta))\]
OpenStudy (zepp):
In your question, \(\large \alpha = 6\theta\) and \(\large \beta=2\theta\), replace and solve.
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