If dy/dx=2y^2 and if y= -1 when x=1,then when x=2,y=?

If dy/dx=2y^2 and if y= -1 when x=1,then when x=2,y=? find dy/dx at x=2 if y=6u^2-11and u=3x^2+2 if y=6x+1 then dy/dx=? Find out F(1)=?If dy/dx =1/2x,and f(e)=0 二阶求导数Find d^2y/dx^2 if y^2+2y=4x^2+2x2y*dy/dx+2*dy/dx=8x+2dy/dx=(4x+1)/(y+1)d^2y/dx^2=(4(y+1)-4(x+1)(dy/dx))/(y+1)^2我不明白最后的一步.为什么那里要乘上dy/dx?按照除法则不是应该乘上y+1的导数吗?但是下一步 (x^2)dy+（y^2)dx=dx-dy If y = f(u) and u = g(x),where f and g are twice differentiable functions,show thatd2y/dx2 =d2y/du2 (du/dx)＾2 +dy/du(d2u/dx2)f 和 g 两次微分 y=lnx^2,dy/dx= 微分方程 dy/dx=(-2x)/y dy/dx=?,if y=[3^√x+1]^4Y等于（x+1开3次方）^4,求dy/dx=?, Find dy/dx if ln(y)=e^(6y)sin(4x),求 y`(x)=?如题 解方程y^2+x^2*(dy/dx)=x*y*(dy/dx) dy/dx=x/2y dy/dx=x+y 反函数的二阶导数疑问设dy/dx=y',则dx/dy=1/y',应视为y的函数则d2x/dy2=d(dx/dy)/dy（定义）=d(1/(dy/dx)) / dy=d(1/(dy/dx))/dx * dx/dy（复合函数求导,x是中间变量）=-y''/(y')^2 * (1/y')=-y''/(y')^3d(1/(dy/dx))/dx * dx/dy 若y=sinx^2,则dy/dx^2= ; dy/dx= Y=2-sinx.求dy/dx及dy/dx|x=0 已知y=sinx^2求dy/dx^3 dy/dx^4要详细过程 If y=xe^x(e的x次方),求dy/dx=?,为什么由y=xe^x可得dy=e^xd+dxe^x