Find a,b,c so that directional derivative φ=axy^2+cz^2x^3+byz at (1,2,-1)max value 64 parallel to z
#Find a,b,c so that directional derivative φ=axy^2+cz^2x^3+byz at (1,2,-1)has maximum value 64 in a direction parallel to z-axis @PTE #directionalderivative #gradient directionalderivative #directionalderivative solved problems #how to find directional derivative
