Derivative: arctan(sqrt((1-x)/(1+x)))

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SUMMARY

The derivative of the function arctan(sqrt((1-x)/(1+x)) is calculated using the Chain Rule and the Quotient Rule. The correct expression for the derivative includes the factors: 1/(1 + (sqrt((1-x)/(1+x)))^2) multiplied by 1/2(sqrt((1-x)/(1+x)))^(-1/2) times the derivative of the quotient inside the radical. Simplifying this expression requires careful application of these rules, particularly in handling the derivative of the quotient and the square root terms.

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Homework Statement


Find the derivative:
arctan[tex]\sqrt{(1-x)/(1+x)}[/tex]


Homework Equations


Chain Rule, Quotient Rule


The Attempt at a Solution


I've gotten to a point where I feel like I either don't know how to simplify from this point, or I've done something wrong:
[1/(1+((1-x)/(1+x)))] * [(-[tex]\sqrt{(1+x)}[/tex]/2*[tex]\sqrt{1-x}[/tex])-([tex]\sqrt{1-x}[/tex]/2*[tex]\sqrt{1+x}[/tex])]
 
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It looks about right (I didn't check that closely), but I don't understand some of what you have shown, namely the parts where it looks like you're dividing by 2.

Your derivative should look like this:
1/(1 + (sqrt(quotient in radical))^2) * 1/2(quotient in radical)^(-1/2) * (derivative of quotient inside radical)

The first factor you show looks fine, but I don't understand what you have after that.
 

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