已知y^2(1+x^2)=c求dy/dx

已知y^2(1+x^2)=c求dy/dx 已知x=y^2-4y,求dy/dx 已知y=x^cosx/2,求dy/dx, 已知dx/dy=1/y′,求d（2）y/d x^2? 已知y=x^(1/y),求dy/dx? 已知dx/dy＝1/y',求d^2 x /dy^2 设y=√(x^2-1)求dy/dx x^2+xy+y^3=1,求dy/dx 求dy/dx-2y/x=1的通解 设y=sin2x/(1+x^2),求dy/dx, 设y=sin2x/(1+x^2),求dy/dx, 求dy/dx y=e^(2x+1) y=f[(x-1)/(x+1)],f'(x)=arctanx^2,求dy/dx,dy 已知x^y-y^x=2确定函数y=fx,求dy/dx (x^2)dy+（y^2)dx=dx-dy x^y-y^x=2,求dy/dx 求dy/dx=(x-y+5)/(x+y-2) dx/dy=1/y',求d^2x/dy^2 .为什么d^2x/dy^2不等于dx/dy求导?一个是二阶导数,一个是一阶导数