Find f so that F = ?f. If the fuction is not conservative state so.F(x,y, z) = (3y - 15x sin z)i + (3x + 15 cos z)j + ezk

A. f(x, y, z) = 3xy + ez - 15 cos z + C
B. f(x, y, z) = 3xy + ez + 15 cos z + C
C. f(x, y, z) = 3xy + ez + C
D. not conservative


Answer: D

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