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Taylor series help

Find the taylor expansion of cos2x in power of (x-pi/4) up and including the term in (x-pi/4)^5

Found this but am now stuck on part b:
Use your answer to part a to obtain an estimate of cos2 giving your answer to 6 decimal places.

Do I sub in x=pi/4 +2 into the expansion because it doesn't seem to work?
Original post by bobbricks
...


You just need to let x equal 1.

Edit2: Yep that works.

Here's the Wolfram link if you need to check your expansion.
(edited 9 years ago)

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