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# The Bessel function of order 1 is defined by $J_1 (x) = \sum_{n = 0}^{\infty} \frac {(-1)^n x^{2n + 1}}{n! (n + 1)! 2^{2n + 1}}$(a) Show that $J_1$ satisfies the differential equation $x^2 J''_1 (x) + xJ'_1(x) + (x^2 - 1) J_1(x) = 0$(b) Show that $J'_0 (x) = -J_1 (x).$

## a. $0=0$B. $J_{0}^{\prime}(x)=-J_{1}(x)$

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