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Derive an identity for cos(2theta), done fast in 56 seconds

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sin2𝜃 = 2sin⁡𝜃cos⁡𝜃 (1 of 4)

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PreCalculus - Trigonometry: Trig Identities (30 of 57) Proof sin^2(x)=(1-cos2x)/2

Prove that sin(2 theta)=2sin theta cos theta.

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sin2 + cos2=1

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Convert r^2cos(2theta)=1 to Cartesian

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