求关于求导数的题目过程
要过程!!!
dy/dx=d[sin(x+y)]/dx=[cos(x+y)](1+dy/dx) 所以dy/dx=[cos(x+y)]/[1-cos(x+y)]=1/[1-cos(x+y)]-1 还可以得到1+dy/dx=1/[1-cos(x+y)] d^2y/dx^2=-{[sin(x+y)](1+dy/dx)}/[1-cos(x+y)]^2 =-[sin(x+y)]/[1-cos(x+y)]^3
答:sin(x+dx)=sinxcosdx+cosxsindx sin'x=lim dx->0 (sin(x+dx)-sinx)/dx =lim dx->0 (si...详情>>
答:详情>>