How do you reduce a fraction to its simplest form?

By seeing if there is a number that can go into the numerator and denominator

To reduce a fraction you divide the top and bottom fraction by the same number until you cannot divide one side anymore

example: 9/12
9÷3=3
12÷3=4

reduced fraction 3/4

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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.