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tan^-1 2x+tan^-1(1/(x+4))=pi/2 નો ઉકેલગણ...

`tan^-1 2x+tan^-1(1/(x+4))=pi/2` નો ઉકેલગણ ________છે.

A

`phi`

B

{2}

C

{4}

D

`{-2}`

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