4. Suppose f is differentiable at x = 10- (a) Show that f(xo+h)-f(xo) h f(ro+h)-f(xo - h) (b) Show that 2h lim h→0 lim h→0 : f'(xo). = f'(ro).

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A: setting z=0 and solving for x and y. similarly setting y=0 and solving for x and z.

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