look f(x,y,z)=x^4+6y^8+17z^9 and what to do to make something with z to get f(x,Y) but do not give 0 to z,x,y x,y,z∈R R= real number
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look f(x,y,z)=x^4+6y^8+17z^9 and what to do to make something with z to get f(x,Y) but do not give 0 to z,x,y x,y,z∈R R= real number