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While Wolfram alpha got me through Cal 2, why are you plugging it here?

WolframAlpha includes a lot of Mathematica features and many uses are free-as-in-beer. For example,it can evaluate Mathematica expressions like Series[x - n Sin[x], {x,0,5}]. http://m.wolframalpha.com/input/?i=Series%5Bx+-+n+Sin%5Bx%5D...