For some strange reason I don't know how these equal each other; u^2/ u^2-4 = 1+ 4/ u^2-4 help?
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Originally Posted by klooless For some strange reason I don't know how these equal each other; u^2/ u^2-4 = 1+ 4/ u^2-4 help? $\displaystyle \frac{u^2}{u^2-4} = 1 + \frac{4}{u^2 - 4}$ Multiply both sides by $\displaystyle {u^2 - 4}$ Gives $\displaystyle u^2 = u^2 - 4 + 4$ Your brackets may have caused some confusion, perhaps...
Most likely, yes. but what step is taken to get from the left to the right side?
$\displaystyle \frac{u^2}{u^2-4} = \frac{u^2-4+4}{u^2-4} = \frac{u^2-4}{u^2-4} + \frac{4}{u^2-4} = 1 + \frac{4}{u^2-4}$
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