Question: 4. Use De-Moiver's formula to derive the following trigonometric identities (a) cos 30 = cos 0 3 cos 0 sin? 0 (b) sin 30


4. Use De-Moiver's formula to derive the following trigonometric identities (a) cos

4. Use De-Moiver's formula to derive the following trigonometric identities (a) cos 30 = cos 0 3 cos 0 sin? 0 (b) sin 30 = 3 cos? 0 sin 0 sin 0 COS

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