Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 1

(ii)

Find the values of $\sin 2\alpha$, $\cos 2\alpha$ and $\tan 2\alpha$, when:

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(ii)

cos⁡α=45\cos\alpha = \dfrac{4}{5}, where 0<α<π20 < \alpha < \dfrac{\pi}{2}

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