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If the inverse trigonometric functions take principal values, then ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 4 tan sin 5 2 3 4 tan cos 10 3 cos 1 – 1 – 1 – is equal to :

1. 0
2. 4 π
3. 3 π
4. 6 π

Correct answer: 3 π

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