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

(viii)

Prove the following identities:

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(viii)

2sin⁡θsin⁡2θcos⁡θ+cos⁡3θ=tan⁡2θtan⁡θ\dfrac{2\sin\theta \sin 2\theta}{\cos\theta + \cos 3\theta} = \tan 2\theta \tan\theta

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