How to calculate the drivative of tan -1 (x/sqrt(1-x^2))?
The solution says it set y = as sqrt(x-1) and it gives dy/dx = -1/(2sqrt(x-1)). How is that possible? (Problem 2 18.01, Integration Techniques PDF 5A - 3g)

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Try to use Method of Substitution here x=cos2A will work

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