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10 cards from this deck
cos2θ+sin2θ=1\cos^2\theta + \sin^2\theta = 1cos2θ+sin2θ=1
1+tan2θ=sec2θ1 + \tan^2\theta = \sec^2\theta1+tan2θ=sec2θ
1+cot2θ=cosec2θ1 + \cot^2\theta = \cosec^2\theta1+cot2θ=cosec2θ
sinθcosθ\frac{\sin \theta}{\cos \theta}cosθsinθ
1cosθ\frac{1}{\cos \theta}cosθ1
cosθsinθ\frac{\cos \theta}{\sin \theta}sinθcosθ
1sinθ\frac{1}{\sin \theta}sinθ1
Divide 1st identity by cos2θ\cos^2\thetacos2θ
Start with the more complex side
When cosθ=0\cos \theta = 0cosθ=0
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