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## Homework Statement

As part of a calculus question, the solutions manual takes [tex]\frac{2y^{2}}{4+y^{2}}[/tex]

And somehow turns it into [tex]\left(2-\frac{8}{4+y^{2}}\right)[/tex]

Ive scribbled all the things i can thinkof on paper and still can't seem to get from one to the other, its driving me nuts!

Any help would be much appreciated :D.

Cheers.