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Write the Sum Without Sigma Notation and Evaluate It k=142cosπk\sum _ { \mathrm { k } = 1 } ^ { 4 } 2 \cos \frac { \pi } { \mathrm { k } }

question 62

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Write the sum without sigma notation and evaluate it.
- k=142cosπk\sum _ { \mathrm { k } = 1 } ^ { 4 } 2 \cos \frac { \pi } { \mathrm { k } }


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