Is this sum/difference identity correct? $$\text{sin}{(120^{\circ} - 150^{\circ})} = \text{sin}{(120^{\circ})}\text{cos}{(150^{\circ})} + \text{cos}^2{(120^{\circ})} $$

Trigonometry Identities - Sum/Difference Identity True/False (Degrees)

Level 1

The topics in this unit focus on mastering the basic trigonometric identities. Work on practice problems directly here, or download the printable pdf worksheet to practice offline.

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Trigonometry Identities - Sum/Difference Identity True/False (Degrees)

Is this sum/difference identity correct?

\text{tan}{(315^{\circ} - 120^{\circ})} = \frac{\text{cos}(315^{\circ}) + \text{sin}(120^{\circ})}{1-\text{tan}(315^{\circ})\text{tan}(120^{\circ}) }

Earned ?