d^2y/dx^2+a^2y-b^2=0 求解=_=d^2y/dx^2+a^2y-b^2=0求解=_=

d^2y/dx^2=a-(dy/dx)^2*(1/y)a为常数~ d^2y/dx^2+a^2y-b^2=0 求解=_=d^2y/dx^2+a^2y-b^2=0求解=_= (d^2 y/dx^2)+(dy/dx)-2y=0的通解是多少 微分方程d^2y/dx^2-2dy/dx-3y=0的通解 d^2y/dx^2-dy/dx-6y=0的一阶线性微分方程是多少 d^2y/dx^2-dy/dx-6y=0的一阶线性微分方程是多少 求微分方程通解 d^2y／dx^2-e^y* dy／dx=0 d^2y/dx^2=a-(dy/dx)^2*(1/y). 方程里的a是常数 x=a(θ-sinθ) y=a(1-cosθ)x=a(θ-sinθ),y=a(1-cosθ).求d^2y/dx^2.dy/dx=cotθ/2,d^2y/dx^2=d/dx*dy/dx=d（dy/dx)/dθ*dθ/dx=d(dy/dx)/dθ*1/dx/dθ= 我想问哈d^2y/dx^2那后面d（dy/dx)/dθ*dθ/dx=d(dy/dx)/dθ*1/dx/dθz这两步是如何化解的. 设y=xcosx;求(d^2y)/(dx^2) d^2y/dx^2+y=4sinx y=lnsinx 求d^2y/dx^2 (d^3y/dx^3)-2(d^2y/dx^2)-dy/dx+2y=0的通解怎么求?RT d^2y/dx^2 + y = 0最后因该是y=?,实在是一窍不通 下列微分方程中,不是全微分方程的是（）A.y(x-2y)dx-x^2dy=0 B.(x^2+y^2)dx+xydy=0C.2e^ydx+x(xe^(2y)-2y)dy=0 D.(3x^2+6xy)dx+(6x^2+4y^2)dy=0 d/dx((x^2+y^2)^2)=d/dx(x^2-y^2),求（化简）dy/dx=? 高阶导数,dx/dy=1/y',怎样推导d^2y/dx^2=(-y'')/(y')^3. 微分方程(y+xy^2)dx+(x-x^2y)dy=0是（）A全微分方程B一阶线性方程C可分离变量方程D都不对