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જો alesin^-1 x+cos^-1 x+tan^-1 xleb તો...

જો `alesin^-1 x+cos^-1 x+tan^-1 xleb` તો

A

`a=0,b=pi`

B

`a=0,b=pi/2`

C

`a=pi/2,b=pi`

D

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