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10 cards from this deck
Find trig values of 2α using values of α
From compound angle formulae, set both angles equal
2sinαcosα2 \sin α \cos α2sinαcosα
cos2α−sin2α\cos^2 α - \sin^2 αcos2α−sin2α
1−2sin2α1 - 2 \sin^2 α1−2sin2α
2cos2α−12 \cos^2 α - 12cos2α−1
Three
sin2α+cos2α=1\sin^2 α + \cos^2 α = 1sin2α+cos2α=1
Use form that makes calculation easiest
Denominators = 0 or tanθ\tan θtanθ undefined
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