Write the sum without sigma notation and evaluate it.

A. 6 cos ? + 216 cos 3? = -222
B. 6 cos ? + 36 cos ? + 216 cos ? = -258
C. 6 cos ? + 36 cos 2? + 216 cos 3? = -186
D. 6 cos ? + 36 cos 2? + 216 cos 3? = 186


Answer: C

Mathematics

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