`int (x^4-4)/(x^2sqrt(4+x^2+x^4)) dx=`

int(dx)/(x^2sqrt(4+x^2))

int(x^4-1)/(x^2sqrt(x^4+x^2+1))dx= sqrt(x^2+1/(x^2)+1)+C (sqrt(x^4+x^2+1))/(x^2)+C (sqrt(x^4+x^2+1))/x+C (d) none of these

int((x^4-1)dx)/(x^2sqrt(x^4+x^2+1))

int(2x-4)/(sqrt(x-2) dx

int (dx)/(x sqrt(x^2+4x-4))

int(1)/(sqrt(4x^(2)-x+4))dx

int(1)/(sqrt(4x^(2)-x+4))dx

Evaluate: int(dx)/((x^2+4)sqrt(x^2-4))

int(2x)/(sqrt(1-x^(2)-x^(4)))dx=