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Find the smallest and the largest values...

Find the smallest and the largest values of `tan^(-1) ((1 - x)/(1 + x)), 0 le x le 1`

A

`(0, pi/4)`

B

`(0, pi/2)`

C

`(- pi/4, pi/4)`

D

`(pi/4, pi/2)`

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The correct Answer is:
A
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