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17. Find the Taylor series for cos x about 4. [Hint: Use an identity for cos 2k+1 2k (-1)* +00 (-1)* ΣΕΤ Ans. (2k +1)! k=0 k-
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Sol: ofor cost about / Aim is to find the Taylor series We know that, at (a) is, function can be defined of a The Taylor sericonsider, (05()= consider 4 (1054)(3) = -(6807) [8] E-sing - © dy 3 consider y (604)*7) - 22222211222222211JJJJJJJJJJJJJJJJJJThis can be written asi **(-p)*++ (2x) + **(-) + auto (143) =*(29)() - (43) + tos (2-? Eph To(I--) * + (31) - 2E+ (2x+1! (KPD

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