Maxima and minima (trapezoidal gutter)

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Maxima and minima (trapezoidal gutter)

I have a problem sir.



dA/db=1/4[(b+a)-2(b-a)/2√4a^2-(b-a)^2 + √4a^2-(b-a)^2]=0.

How did it become +√4a^2-(b-a)^2]=0?
How did it become zero? Why is there zero?

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