If you have $27 to spend on
$5 godiva bars and $1 tootsie
rolls, how many ways can you
spend all your money without
receiving change?

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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.