The number of points at which the girapi oi a function f: r3-r given by formula f(x,y,z) = x + y + z on set m = {x,y,z) e r$: x+ y2 1, z 1} then the max value o

The number of points at which the girapi oi A function f: R3-R given by formula f(x,y,z) = x + y + z on set M = {x,y,z) e R$: x+ y2 1, z 1} then the max value of f is. 1 Tho value of a for which f is differentiable