Write the sum without sigma notation and evaluate it.
A. 4 cos ? + 64 cos 3? = -68
B. 4 cos ? + 16 cos ? + 64 cos ? = -84
C. 4 cos ? + 16 cos 2? + 64 cos 3? = -52
D. 4 cos ? + 16 cos 2? + 64 cos 3? = 52
Answer: C
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