Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 4

(i)

Prove that:

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(i)

cos⁡15∘+cos⁡105∘+cos⁡195∘+cos⁡160∘+cos⁡285∘=0\cos 15^\circ + \cos 105^\circ + \cos 195^\circ + \cos 160^\circ + \cos 285^\circ = 0

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(ii)
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