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The value of cot ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + ∑ ∑ = = − 23 1 n n 1 k 1 k 2 1 cot is -
- 25 23
- 23 25
- 24 23
- 23 24
Correct answer: 23 25
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