Where ia the hole in the graph of the rational function f(x)=(8x+8)/(x^2-1)? A. (-1,4)
B. (1,4)
C. (-1,-4)
D. There is no hole in the function.

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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.