Classify each function as linear or nonlinear.

4x-y=3 linear,2x²=12-8y linear,-6x=3y -17..linear

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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.