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The values of 2cot^-1 (1/2)-cot^-1 (4/3)...

The values of `2cot^-1 (1/2)-cot^-1 (4/3)` is

A

`-pi/8`

B

`(3pi)/2`

C

`pi/4`

D

`pi/2`

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The correct Answer is:
D
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