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The integral ∫ π π + 4 / 6 / 5 5 ) x cot x (tan x 2 sin dx equals :

1. 40 π
2. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − 3 9 1 tan 20 1 1
3. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − π − 3 9 1 tan 4 10 1 1
4. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − π − 3 3 1 tan 4 5 1 1

Correct answer: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − π − 3 9 1 tan 4 10 1 1

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