Double angle rule

by jvadair

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\sin2\theta

2\sin\theta\cos\theta

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3 cards

1

\sin2\theta

2\sin\theta\cos\theta
2

\cos2\theta

\cos^2\theta-\sin^2\theta\ \ OR\ 2\cos^2\theta-1\ OR\ 1-2\sin^2\theta
3

\tan2\theta

\frac{2\tan\theta}{1-\tan^2\theta}