Colunis: (1) In the adjoining figure lines AB and CD intersect each other at O, if m angle AOD = 47 degree Find (1) m angle AOC (ii) m angle BOC (iii) m angle BOD.​

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

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