$\"\"$

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The function is $\"s$

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$\"s$

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$\"s$

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$\"s$

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$\"s$

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$\"Syntax$

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$\"Syntax$ (Apply the summation formulas)

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$\"Syntax$

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$\"Syntax$

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$\"Syntax$

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$\"Syntax$

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$\"\"$

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$\"Syntax$ (Apply limits)

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$\"Syntax$ (Simplify)

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$\"Syntax$ (Limits proparty)

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$\"Syntax$ (Simplify)

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$\"\"$

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The function is $\"S$

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$\"S$

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$\"S$

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$\"S$

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$\"S$ (Apply the summation formulas)

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$\"S$

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$\"\"$

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$\"italic$ (Apply limits)

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$\"Syntax$ (Simplify)

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$\"Syntax$ (Limits proparty)

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$\"Syntax$ (Simplify)

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$\"italic$ (Limits proparty)

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$\"italic$ (Simplify)

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$\"\"$

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Therefore $\"italic$ .