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If greatest and least values of `f(x)=sin^(-1)(x/(sqrt(x^2+1)))-lnx` in `[1/(sqrt(3)),sqrt(3)]` are M & m respectively, then `M+m=ln3+pi/6` (b) `M-m=ln3-pi/6` `M+m=pi/2` (d) `M-m=ln3-pi/3`

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