The range of f(x)= sin^(-1)x +cos^(-1)x+...

The range of `f(x)= sin^(-1)x +cos^(-1)x+ tan^(-1) x` is

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`-1<=x<=1`
`x in R`
`sin^(-1)x+cos^(-1)x=pi/2`
`f(x)=pi/2+tan^(-1)x`
`R(f(x))=[pi/2-pi/4,pi/22+pi/4]`
`=[pi/4,3/4pi]`
Option 2 is correct.

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