Question: kindly solve this [3] 9. (a) Show that the function f() = (-1) x2n 1=0 (2n)! is a solution of the differential equation f(x) +

kindly solve this

[3] 9. (a) Show that the function f() = (-1)" x2n 1=0 (2n)! is a solution of the differential equation f"(x) + f(x) = 0. [3] (b) Find the radius of convergence of the series. [1] (c) Evaluate f (w/4)

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