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l. Evaluate the following path integrals f (x, y, z)ds , where (a) f (x, y, z) = e z and 6 = t e [0, l] (b) f (x, y, z) = yz and = (t,3t, 2t), t e [1, 3] 2 3/2 , t , tell, 2] and= t, t 3