S. 09. (a) If A = (4xy-3x2z")i + (4y + 2x")j + (1 2x%z)k, prove that A• dr is independent of the curve C joining two given points. (b) Evaluate the integral in (a) if C is the curve from the points (1,-1, 1) to (2,-2, -1). Ann. (b) -19

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