18 students are going on a field trip, the bus can fit 14 so 4 of them will have to ride
in a car. In how many ways can we chose the 4 students who must ride in the car?

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Hello! i hope this
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.