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Let x * y = x 2 + y 3 and (x * 1) * 1 = x * (1 * 1). Then a value of ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + − + − 2 x x 2 x x sin 2 2 4 2 4 1 is

1. 4 π
2. 3 π
3. 2 π
4. 6 π

Correct answer: 3 π

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