Write the sum without sigma notation and evaluate it.
A. 3 cos ? + 9 cos 2? + 27 cos 3? = -21
B. 3 cos ? + 9 cos 2? + 27 cos 3? = 21
C. 3 cos ? + 27 cos 3? = -30
D. 3 cos ? + 9 cos ? + 27 cos ? = -39
Answer: A
Mathematics
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