(a) Compute the derivative of the function F(x, Y, z) = x² + 2y² – 3z? at the point (1,1, 1) in the direction of v =i+j+k. %D (b) Let f(x,y, z) = xz sin(y). Compute the limit f(1+h, T – h,-1) – f(1,7, –1) -1) – f(1, 7, –1) lim h→0 h

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