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⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π − − − 4 3 tan tan 6 7 cos cos 3 2 sin sin 1 1 1 is equal to :

1. 12 11 π
2. 12 17 π
3. 12 31 π
4. 4 3 π −

Correct answer: 12 11 π

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