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in Sets, Relations and Functions by (115k points)
What is the domain of the function f(x) = sin-1 (x + 1) ?
1. [-1, 1]
2. [-2, 0]
3. [-2, 0)
4. [-2, 2]

1 Answer

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Correct Answer - Option 2 : [-2, 0]

Concept:

Domin of sin-1 x is [-1, 1]

Adding or subtracting the same quantity from both sides of an inequality leaves the inequality symbol unchanged.

Calculation:

Given:  f(x) = sin-1 (x + 1) 

As we know, domin of sin1 x is [-1, 1]

Therefore, -1 ≤ (x + 1) ≤ 1

subtracting 1 in above inequality, 

⇒ -1 - 1 ≤ x + 1 - 1 ≤ 1 - 1

⇒ -2 ≤ x ≤ 0

∴ Domin of sin-1 (x + 1) is [-2, 0]

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