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14-11-2018
Mathematics

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Jana is proving that the following trigonometric identity is true: cos(−θ)⋅tanθ=sinθ

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Аноним Аноним

14-11-2018

Using the identity tan(θ) = sinθ / cosθ :-

cos (-θ) . tanθ = cos(-θ) . sinθ / cosθ

Now. cos(-θ) = cosθ

- so we see that the right side of the identity simplifies to sinθ which completes the proof.

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16-12-2020

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