Is this product to sum identity correct? $$\text{cos}{(135^{\circ})}\text{cos}{(120^{\circ})} = \frac{1}{2} \left[ \text{sin}(135^{\circ} + 120^{\circ}) + \text{sin}(135^{\circ} - 120^{\circ}) \right] $$

Practice: Trigonometry Identities - Product to Sum Identity True/False (Degrees)

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Trigonometry Identities - Product to Sum Identity True/False (Degrees)

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Trigonometry Identities - Product to Sum Identity True/False (Degrees)

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