Let $f ( x , y , z ) = \sqrt { 4 - x ^ { 2 } - y ^ { 2 } }$ .(a) Evaluate $f ( 1 , - 1,2 )$ .(b) Sketch the domain of $f$ .(c) What is the range of the function $f$ ?

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The Answer of Let $f ( x , y , z ) = \sqrt { 4 - x ^ { 2 } - y ^ { 2 } }$ .(a) Evaluate $f ( 1 , - 1,2 )$ .(b) Sketch the domain of $f$ .(c) What is the range of the function $f$ ?

Let f(x,y,z)=4−x2−y2f ( x , y , z ) = \sqrt { 4 - x ^ { 2 } - y ^ { 2 } }f(x,y,z)=4−x2−y2​

Let $f ( x , y , z ) = \sqrt { 4 - x ^ { 2 } - y ^ { 2 } }$