Find S (2x² -4/x² )dx

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if those functions under the radical are multiplied together they can be expanded as:

I=((x1+x2)^2 - 1)*(1-(x1-x2)^2)/8

let u=x1+x2 and v=x1-x2

I = (u ^ 2–1) * (1-v ^ 2)

du = dx1 + dx2; dv = dx1-dx2;

dx1 * dx2 = (du-dx2) * (dx1-dv)

or-or-or ...

int(I)*dx1*dx2=5/2

Step-by-step explanation:

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2y+y=5

add 2y and y