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Let f be a differentiable function in ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π 2 , 0 . If ∫ 1 x cos 2 dt ) t ( f t = sin 3 x + cos x, then ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ′ 3 1 f 3 1 is equal to

1. 6 – 2 9
2. 6 – 2 9
3. 2 6 2 9 −
4. 6 2 9 −

Correct answer: 6 – 2 9

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