Write an absolute value inequality for the following: Do not solve.

A solid at 50°C will change to a gas or liquid if the temperature t increases or decreases more than 50°C.

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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.