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

(iv)

Prove the following identities:

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(iv)

cos⁡α−sin⁡αcos⁡α+sin⁡α=sec⁡2α−tan⁡2α\dfrac{\cos\alpha - \sin\alpha}{\cos\alpha + \sin\alpha} = \sec 2\alpha - \tan 2\alpha

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