1+cos 2 1–Cosx 4. a) Derive the half-angle formula for cos= ±¸ and sin = ±¸ from a double angle formula for sine and cosine. Hint: use the double angle formula and try to rearrange it for what is given above. Explain your steps like Identities. b) Determine the value of cos c) Determine the value of sin (2)

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