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Question

Domain of the function f(x)=sin1(1+3x+2x2) is


A

( -∞, ∞)

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B

( -1 , 1)

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C

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D

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Solution

The correct option is C


11+3x+2x3 1

Case | : 2x3+3x+1 1;2x3+3x+2 0

x=3±9166=3± i76 (imaginary).

Case || : 2x3+3x+1 1

2x2+3x 0 2x(x+32 0)


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