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3. Is the series cos(n) n conditionally convergent? You may use the following facts: . | cos(n) | 2 cos2 (n). . The sum of

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3. Is the series cos(n) n conditionally convergent? You may use the following facts: . | cos(n) | 2 cos2 (n). . The sum of a convergent and divergent series is divergent. S cos (2n) In=1 2n is convergent

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