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Let f(x) = x cos x sin 2 cos x sin − − + , x ∈ [0, π ] – ⎭ ⎬ ⎫ ⎩ ⎨ ⎧π 4 . Then ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π 12 7 " f 12 7 f is equal to -

1. 9 2
2. 3 2 −
3. 3 3 1 −
4. 3 3 2

Correct answer: 9 2

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