Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 2

(ix)

Prove the following identities:

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(ix)

sin⁡3θsin⁡θ−cos⁡3θcos⁡θ=2\dfrac{\sin 3\theta}{\sin\theta} - \dfrac{\cos 3\theta}{\cos\theta} = 2

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