Mathematics Relations and Functions Range of a Function

Let f(x) = 2 cos^-1 x + 4 cot^-1x - 3x²- 2x + 10, x ∈ [- 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

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