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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.

PracticeWorksheetView

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

Is this double-angle identity correct?

cos(2⋅315∘)=2cos2(315∘)−1\text{cos}{(2\cdot315^{\circ})} = 2\text{cos}^2(315^{\circ}) - 1

?