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What are Double Angle Identities?

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Nov 6, 2014

Double Angle Identities

$sin 2 θ = 2 sin θ cos θ$ $sin2theta=2sin theta cos theta$

$cos 2 θ = {cos}^{2} θ - {sin}^{2} θ = 2 {cos}^{2} θ - 1 = 1 - 2 {sin}^{2} θ$ $cos2theta=cos^2theta-sin^2theta=2cos^2theta-1=1-2sin^2theta$

$tan 2 θ = \frac{2 tan θ}{1 - {tan}^{2} θ}$ $tan2theta={2tan theta}/{1-tan^2theta}$

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