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The value of ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + ∑ = − 50 1 n 2 1 n n 1 1 tan cot is-

1. 25 26
2. 26 25
3. 51 50
4. 51 52

Correct answer: 25 26

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