Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 5

(i)

Prove that:

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(i)

cos⁡20∘cos⁡40∘cos⁡60∘cos⁡80∘=116\cos 20^\circ \cos 40^\circ \cos 60^\circ \cos 80^\circ = \dfrac{1}{16}

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(ii)
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