Write the transformation form of the equation for the cosine function that has been compressed vertically by a factor of 1/2, stretched horizontally by a factor of 4, and shifted down 1 unit

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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.