Differentiate log (x + (1+x 2 ) 1/2 ) .
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log (1+(1+x^2)^1/2)
now differentiate w.r.t x
1/(1+(1+x^2)^1/2). {0+1/2. (1+x^2)^-1/2}.2x
hence
1/{1+(1+x^2)^1/2}. {1/2. (1+x^2)^-1/2}(2x)
now differentiate w.r.t x
1/(1+(1+x^2)^1/2). {0+1/2. (1+x^2)^-1/2}.2x
hence
1/{1+(1+x^2)^1/2}. {1/2. (1+x^2)^-1/2}(2x)
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