What is the value of a^3 - b^2 for a = 3 and b = 1/2

a^3 - b^2 for a = 3 and b = 1/2
3^3 - (1/2)^2
= 27 - 1/4
= 26 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.