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If y=(1)/(3) "log"(x+1)/(sqrt(x^(2)-x+1)...

If `y=(1)/(3) "log"(x+1)/(sqrt(x^(2)-x+1))+(1)/(3)"tan"^(-1)(2x-1)/(sqrt(3))`, show that,
`(d^(2)y)/(dx^(2))=-(3x^(2))/((1+x^(3))^(2))`

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