Question: a. Using cos 2A 2 cos 2 A 1 1 2 sin 2 A, show that: b. Given that cos

a. Using cos 2A ≡ 2 cos2 A − 1 ≡ 1 − 2 sin2 A, show that:i cos ||| = 1 + cos x 2 ii sin. sin-

b. Given that cos θ = 0.6, and that θ is acute, write down the values of:||| 1 - cos x 2

c. Show that 

i cos ||| = 1 + cos x 2 ii sin. sin- ||| 1 - cos x 2

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