1.

If z = xn f(y‚ÅÑx) then$

A. y <sup>∂z</sup>⁄<sub>∂x</sub> + x <sup>∂z</sup>⁄<sub>∂y</sub> = nz
B. 1/y <sup>∂z</sup>⁄<sub>∂x</sub> + 1/x <sup>∂z</sup>⁄<sub>∂y</sub> = nz
C. x <sup>∂z</sup>⁄<sub>∂x</sub> + y <sup>∂z</sup>⁄<sub>∂y</sub> = nz
D. 1/x <sup>∂z</sup>⁄<sub>∂x</sub> + 1/y <sup>∂z</sup>⁄<sub>∂y</sub> = nz
Answer» D. 1/x <sup>‚Äö√Ñ√∂‚àö‚Ć‚àö√°z</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>‚Äö√Ñ√∂‚àö‚Ć‚àö√°x</sub> + 1/y <sup>‚Äö√Ñ√∂‚àö‚Ć‚àö√°z</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>‚Äö√Ñ√∂‚àö‚Ć‚àö√°y</sub> = nz


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