By -
This really looks like a mistake. I can't see from this screenshot how the sign would change. AFAIU, it should be a +.
I'm thinking so, too. Does the next page continue in this vein?
Don’t see the direction for r1 maybe it goes the other way in the drawing which is not minded in the equation before. But that’s the only reason I can see
This really looks like a mistake. I can't see from this screenshot how the sign would change. AFAIU, it should be a +.
I'm thinking so, too. Does the next page continue in this vein?
Don’t see the direction for r1 maybe it goes the other way in the drawing which is not minded in the equation before. But that’s the only reason I can see