Is this power reducing identity correct? $$\text{sin}^2{(45^{\circ})} = \frac{1-\text{cos}(2\cdot45^{\circ})}{2}$$

Trigonometry Identities - Power Reducing 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 - Power Reducing Identity True/False (Degrees)

Is this power reducing identity correct?

\text{cos}^2{(240^{\circ})} = \frac{1+\text{cos}(2\cdot240^{\circ})}{2}

Earned ?