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10 cards from this deck
Two angles that sum to 90°90°90°
cosθ\cos \thetacosθ
sinθ\sin \thetasinθ
cotθ\cot \thetacotθ
Cosine
Cofunction identities
θ=90°+180°n\theta = 90° + 180°nθ=90°+180°n (where nnn is integer)
θ=180°n\theta = 180°nθ=180°n (where nnn is integer)
Each function swaps with its cofunction
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