The Maclaurin series expansions of sinx and cosx are as follows: cos x = 1 2! + 6! 4! x7 + 7! sin x = x – + 3! 5! (a) Determine the first four nonzero terms of cos (x²). (b) Determine the first four nonzero terms of cos²x. (c) What is f( (0) for cos (x²)?

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