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If 2y = 2 1 x sin 3 x cos x sin x cos 3 cot ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + − , x ∈ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π 2 , 0 then dx dy is equal to -

1. x – 6 π
2. 3 π – x
3. 6 π – x
4. 2x – 3 π

Correct answer: x – 6 π

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