Which of the following are true?

A. \(tan\theta =\)\(\frac{sin\theta }{cos\theta }\)

B. \(sin\theta \cos\theta \tan\theta =1-cos^2\theta \)

C. \(cos^2\theta - sin^2 \theta =1-2sin^2\theta \)

This is a part of a set: It's trigo time

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