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If y( α ) = α + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ α + α + α 2 2 sin 1 tan 1 cot tan 2 , α ∈ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π π , 4 3 , then α d dy at α = 6 5 π is :

1. 3 4
2. 4 1 −
3. –4
4. 4

Correct answer: 4

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