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The derivative of tan –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + x cos x sin x cos – x sin , with respect to 2 x , where ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π ∈ 2 , 0 x is :

1. 3 2
2. 1
3. 2
4. 2 1

Correct answer: 2

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