Use Leibnizs theorem (Question 71) to find the following: Data from Question 71 If y = u(x)v(x),

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Use Leibniz’s theorem (Question 71) to find the following:

(a) d dxs (x sin x) (put u = sinx, v = x) d dx(3x + 1)] (b) (re ) d4 d.x4


Data from Question 71

If y = u(x)v(x), prove that

(a) y(x) = u(x)v(x) + 2u(x)v(x) + u(x)v)(x) (b) y(x) = u(x)v(x) + 3u2(x)v(x) + 3u(x)v(x) + u(x)v(x)

Hence prove Leibniz’s theorem for the nth derivative of a product:

n y")(x) = u"(x)v(x) + (1) (-2)(x) n +(2) -u) (n-1)(x)v()(x) 1-)(x)v()(x) + ... + u(x)v")(x)

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