dz/dx=cosx+(dF(siny-sinx)/dx)*(-cosx)
dz/dy=(dF(siny-sinx)/dy)*(cosy)
(dz/dx)cosy+(dz/dy)cosx=[cosx+(dF(siny-sinx)/dx)*(-cosx)]cosy+(dF(siny-sinx)/dy)*(cosy)cosx
=cosxcosy-(dF(siny-sinx)/dx)*(cosxcosy)+(dF(siny-sinx)/dx)*(cosxcosy)
=cosxcosy
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024