(-1)"x2" Σ (2n)! +00 1. For all x E R, cos x = n=0 a. Find a power series that is equal to x cos(x²) for all x E R. b. Differentiate the series in item 1(a) to find a power series that is equal to cos(x²) – 2x² sin(x²) for all x E R. to (-16)"(4n +1) (2n)! c. Use the result in item 1(b) to prove that ) cos(4) – 8 sin(4). n=0

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