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Let tan –1 y = tan –1 x + tan –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 x 1 x 2 , where | x | < 3 1 , then a value of y is :

1. 2 3 x 3 1 x x 3 − −
2. 2 3 x 3 1 x x 3 − +
3. 2 3 x 3 1 x x 3 + −
4. 2 3 x 3 1 x x 3 + +

Correct answer: 2 3 x 3 1 x x 3 − −

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