How to graph this function?

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So I'm trying to graph a function and when I plot the following:
plot(y,(.65*y)-(0.65*y.^2/10.5));
It works fine but when I add in the second part of the equation there's an error that I don't know how to fix
plot(y,(.65*y)-(0.65*y.^2/10.5))-(((1.2*(y^2))/(1+(y^2))));

采纳的回答

Torsten
Torsten 2016-2-16
plot(y,(.65*y)-(0.65*y.^2/10.5))-(((1.2*(y.^2))./(1+(y.^2))));
Best wishes
Torsten.

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