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Which of the following are true?
A. tanθ=tan\theta =tanθ=sinθcosθ\frac{sin\theta }{cos\theta }cosθsinθ
B. sinθcosθtanθ=1−cos2θsin\theta \cos\theta \tan\theta =1-cos^2\theta sinθcosθtanθ=1−cos2θ
C. cos2θ−sin2θ=1−2sin2θcos^2\theta - sin^2 \theta =1-2sin^2\theta cos2θ−sin2θ=1−2sin2θ
This is a part of a set: It's trigo time
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