def : var(y)
integral(1/sqrt(2*t^4 - 3*t^2 - 2), t, 2, 3)      maple can do this
integrate(1/sqrt(2*t^4 - 3*t^2 - 2), t, 2, 3)
 integral(integral(x*y^2, x, 0, y), y, -2, 2)