If del f =2xyz3 i + x2z3 j+ 3x2y2z2 k find the f(x,y,z) at f(1,-2,2)
"f_x=2xyz^3,~f_y=x^2z^3,~f_z=3x^2yz^2,"
"f=x^2yz^3,"
"f(1,-2,2)=1^2\\cdot(-2)\\cdot2^3=-16."
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