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error in the result of the integral
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when generating a surface using the sqrt (4x ^ 2) function and calculating its area the geogebra always says that the value is unknown. What am I missing?
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Which command gives an unknown value? When I create the function f(x)=sqrt(4  x^2) and use Integral(f, 3, 5), or other start and endnumbers, I get the results I want.
chris
Please post your .ggb file
f(x) isn't defined above x=2. Try Integral(f, 0,2) instead of Integral(f, 0,3)
it works for me
perhaps you want the red Volumen in attached
also change Derivative(f)²)) by Simplify(Derivative(f)²))) because GG does integral(1/sqrt(4x^2)) =asin(1/2x) and you expect acos(1/2 x) or use numerical integral or abs(integral(...................)) for area
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