12) add the fractions, and simplify if possible.

(y+7)/(y^2-y-12) - 2/(y^2-9)

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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.

The last one bc that's a calendar