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Q.

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

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a

0,π

b

π4,π2

c

0,π4

d

π4,π4

answer is B.

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Detailed Solution

0x1

tan1(1x1+x)=tan11tan1x=π4tan1x

0x10tan1xπ4

π4tan1x0

0π4tan1xπ4

0tan1(1x1+x)π4

Smallest and longest values of tan1(1x1+x)  are 0,π4

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