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10 cards from this deck
cos2θ+sin2θ=1\cos^2 θ + \sin^2 θ = 1cos2θ+sin2θ=1
tanθ=sinθcosθ\tan θ = \frac{\sin θ}{\cos θ}tanθ=cosθsinθ
−sinθ-\sin θ−sinθ
cosθ\cos θcosθ
Two angles & a side, or two sides & non-included angle
12bcsinA\frac{1}{2}bc \sin A21bcsinA
a2=b2+c2−2bccosAa^2 = b^2 + c^2 - 2bc \cos Aa2=b2+c2−2bccosA
Sine only
θ=tan−1x+k⋅180°θ = \tan^{-1} x + k \cdot 180°θ=tan−1x+k⋅180° where k∈Zk \in \mathbb{Z}k∈Z
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