
Expand tan(x+pi/4)
What is the quickest method to do this Taylor expansion for the first three terms? Somebody previously suggested doing the expansion for tan(x) and then substituting in (x + pi/4) but if I do that I get the following working and run into problems:
http://latex.codecogs.com/gif.latex?...20+%20...%20=?
Thanks in advance.

First of all, the series for is incorrect.
Substitution will give you the Taylor series about . Is it the Maclaurin series that you're looking for? If so, you need to differentiate and evaluation at 0.

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