D . Write 5 ^ ((m + n)/2) * i * n terms of x and y

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.

Xis -1/2
y is 35/4.