Use the simple trigonometry calculator to calculate double angle identities of trigonometric identities online.
Formula:
Double Angle Identities Equations:
(i). sin(2θ) = 2 sin(θ) × cos(θ)
(ii). cos(2θ) = 1 - 2 sin2(θ)
(iii). tan(2θ) = [2 tan(θ)]/[1-tan2(θ)]