1) int[sqrt(x)dx/(4-x)] = |x=t^2| = int[2t^2dt/(4-t^2)] = int[-2+8/(4-t^2)dt] = -2t+4ln((4-t)(4+t))? так?

3) int[sqrt(x+2)dx/x) = | x+2 = t^2| = int[2t^2dt/(t^2-2)], так?