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Let y = y ( x ) be the solution of the differential equation sinx dx dy + y cos x = 4 x , x ∈ (0, π ). If ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π 2 y = 0, then ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π 6 y is equal to:

1. 2 3 9 4 π
2. 2 3 9 8 π −
3. 2 9 8 π −
4. 2 9 4 π −

Correct answer: 2 9 8 π −

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