If f(x) = -2x - 14 and g(x) = 5.x + x^2?,
find f(6) + g(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.