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If x cos 1 y x cos 3 dx dy 2 2 = + , ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π π − ∈ 3 , 3 x and y 3 4 4 = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π , then y ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π − 4 equals -

1. 6 e 3 1 +
2. 3 1
3. 3 e 3 1 +
4. 3 4 −

Correct answer: 6 e 3 1 +

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