• 2022-07-25
    设\(z = z\left( {x,y} \right)\)是由方程\({z^3}{\rm{ + }}3xyz - 3\sin xy = 1\)确定的隐函数,则\( { { \partial z} \over {\partial y}}=\)( )
    A: \( { { y\left( {\cos xy - z} \right)} \over { { z^2} + xy}}\)
    B: \( { { y\left( {z - \cos xy} \right)} \over { { z^2} + xy}}\)
    C: \( { { x\left( {\cos xy - z} \right)} \over { { z^2} + xy}}\)
    D: \( { { x\left( {z - \cos xy} \right)} \over { { z^2} + xy}}\)