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10 questions from this quiz
Identity true for all values; equation true for specific values
secθ=1cosθ\sec \theta = \frac{1}{\cos \theta}secθ=cosθ1
cosec θ=1sinθ\text{cosec } \theta = \frac{1}{\sin \theta}cosec θ=sinθ1
cotθ=1tanθ\cot \theta = \frac{1}{\tan \theta}cotθ=tanθ1
When cosθ=0\cos \theta = 0cosθ=0 (at θ=90°+180°n\theta = 90° + 180°nθ=90°+180°n)
When sinθ=0\sin \theta = 0sinθ=0 (at θ=180°n\theta = 180°nθ=180°n)
tanθ=sinθcosθ\tan \theta = \frac{\sin \theta}{\cos \theta}tanθ=cosθsinθ
cotθ=cosθsinθ\cot \theta = \frac{\cos \theta}{\sin \theta}cotθ=sinθcosθ
Work with one side only to match the other
sinθ\sin \thetasinθ
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