Identify the number marked as (?) in the numerical series below: 5,3, 2, 6, 7, 9, 1,15, 4, 2, 3, 3, 9,5, 1, (?)

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Hello! i hope this
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.