Add. (3 1/2x-2/3)+(-1/4x+1 1/2)+(-1 3/4x+5/6)

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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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