How many ways can 3 of 5 objects be arranged in a row?

I’m not positive but i think it’s none of your buisness

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.

Sry i don't know the answer but are u from kastner?