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જો f(x)=sec^-1x +tan^-1 x તો Df=...

જો `f(x)=sec^-1x +tan^-1 x` તો `D_f`=________

A

`x in [-1,1]`

B

`x in R `

C

`x in (- 00,-1]uu[1,oo)`

D

આપેલ એકપણ નહીં

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