Hello Sunil
x ∈ [1/2, 1] means that the given equation
3 cos-1 x = cos-1 (4x3 - 3x)
Is valid only when 1/2 ≤ x ≤ 1
For other values of x, it is not valid.
Written on Sept. 29, 2017, 10:23 a.m.
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Answer of this question
[1/2, 1] role in question 2 exercise 2.2
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