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Let f(x) = 2 cos –1 x + 4 cot –1 x – 3x 2 – 2x + 10, χ∈ [–1, 1], If [a, b] is the range of the function, f then 4a – b is equal to :

1. 11
2. 11 – π
3. 11 + π
4. 15 – π

Correct answer: 11 – π

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