# Trigonometry – Double-Angle Identities

If you know what sin θ is, could you calculate sin 2θ, cos 2θ, and tan 2θ? Before President ObaMATH, maybe not. But after this Commander-In-TEACH, you sure will! With the aid of our awesome Oval Office student team, we continue our exploration into trigonometric identities. Using double angle formulas, our campaign to solve trig equations is totally successful. Join in the success... YAY MATH!