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Question

The smallest and the largest values of
tan1(1x1+x) , 0x1 are.

A
0,π
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B
0,π4
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C
π4,π4
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D
π4,π2
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Solution

The correct option is C 0,π4
tan1(1x1+x)
0x1
1x+12
111+x12
01x1+x1
xϵ[1,1] by xϵ[0,1]
So, xϵ[0,1]
tan1(1x1+x) ϵ[0,π4]

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