求函数f(x,y)=sinx+cosy+cos(x-y),0≤x,y≤π/2的极值
求函数f(x,y)=sinx+cosy+cos(x-y),0≤x,y≤π/2的极值
求多元函数极值f(x,y)=sinx+cosy+cos(x-y),0≤x,y≤π/2
求函数f(x,y)=sinx+cosx+cos(x-y)的极值,做完和答案有出入.
sinX+sinY=1 cosX+cosY=0 求cos(2X)+cos(2Y)的值
求函数f(x,y)=e^x(x+2y+y^2)的极值
求函数f(x,y)=x^3-y^2-3x+2y的极值
求函数f(x,y)=(6x-x^2)(4y-y^2)的极值
求函数f(x,y)=4(x-y)-x^2-y^2的极值
求函数f(x,y)=4(x-y)-x^2-y^2 的极值?
MATLAB如何下做二元函数的曲线 比如f(x,y)=x^2-y+1 f(x,y)=x^2-cosy+sinx
求函数f(x,y)=4(x-y)-x^2-y^2的极值,x的极值和y的极值
sinx+siny+sinz=0;cosx+cosy+cosz=0;求cos(x-y)