Hi following a link on another thread I began to read On The Electrodynamics Of Moving Bodies(adsbygoogle = window.adsbygoogle || []).push({});

should equal

but I end up with a minus instead of a plus between the two fractions(in the last equation).

I've gone through my calculations but I cannot see where I've gone wrong.

I could post my working out if neccessary but it might be hard to read in this format

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# Algebra problem

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