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જો |x|le1/ 2 તો 2 tan^-1x+sin^-1((2x)/(...

જો `|x|le1/ 2` તો `2 tan^-1x+sin^-1((2x)/(1+x^2))`=_________

A

`4 tan^-1 x`

B

0

C

`pi/2 `

D

`pi`

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