From known series deduce the following (the general term is not required): (a) tanx=x+jx+ +... 2x4 4!

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From known series deduce the following (the general term is not required):

(a) tanx=x+jx+ +... 2x4 4! 2x 3! 2x (b) cosx = 1 - + 2! (c) et cos x = 1 + x - 25x6 6! 2xx42xx5 + 4! 5! 12 4

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