Is this double-angle identity correct? $$\text{tan}{(2\cdot225^{\circ})} = \frac{2\text{tan}(225^{\circ})}{1-\text{tan}^2(225^{\circ})}$$

Trigonometry Identities - Double Angle 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 - Double Angle Identity True/False (Degrees)

Is this double-angle identity correct?

\text{sin}{(2\cdot120^{\circ})} = \text{sin}(120^{\circ})\text{cos}(120^{\circ})

Earned ?