bagi yg jago matematika tolng jawab yg di lingkari dg cara.

No. 7
[tex] f_{x} =\frac{1} {2} [x^{2} - y^{2}]^{-1/2}\cdot 2x[/tex]
[tex] f_{y} =\frac{1} {2} [x^{2} - y^{2}] ^{-1/2}\cdot -2y[/tex]