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## Homework Statement

hi guys ,, how are you all ,,

i got another problem -_-

integral(1/sqrt(4 x-x^2), x)

## Homework Equations

## The Attempt at a Solution

i have no idea , i tried and lift it up and make it (4x-x^2)^-0.5 and i even took x as common factor x^-0.5 * (4-x)^-0.5 but still couldn't do anything next ,, any ideas ??