What value of (n) in the expression below would make it a perfect square trinomial? x2 - 14x + n.

А: n = 49
B: n= - 49
C: n = 7
D: n = -7

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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.