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I think that you can write directly ![enter image description here][1] [1]: http://community.wolfram.com//c/portal/getImageAttachment?filename=Untitled-1_1.png&userId=973597
I needed to make the first order Taylor series with the function Series. I received a second order term in the result. Mathematica version 11.0.1.0 on Mac. I think that something is wrong with the function Series[]. I take a simple function as...