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-2x+c1cosx+c2sinx 2x+c1cosx+c2sinx -2x+cosx+sinx -2x+c1cosx+sinx
y=C1+C2x+C3ex+C4e-x y=C1cosx+C2sinx+C3x+C4 y=C1+C2X+C3ex+C4e-2x y=C1ex+C2e-x+C3cosx+C4sinx
y′=2xcosx-x2sinx y′=2xcosx+x2sinx y′=x2cosx-2xsinx y′=xcosx-x2sinx
Acosx+Bsinx x(Acosx+Bsinx) x(Acosx+Bsinx) (Ax+B)sinx+Cxcosx
y=sinx+cosx+C1x+C2 y=-sinx-cosx+C1x+C2 y=sinx-cosx+C1x+C2 y=-sinx+cosx+C1x+C2
3x2cosx+x3sinx 3x2cosx-x3sinx 3x2cosx -x3sinx
-2excosx -2exsinx 2exsinx -2ex(sinx+cosx)
y=C1+C2x+C3ex+C4e-x y=C1cosx+C2sinx+C3x+C4 y=C1+C2X+C3ex+C4e-2x y=C1ex+C2e-x+C3cosx+C4sinx
y=sinx+cosx+C1x+C2 y=-sinx-cosx+C1x+C2 y=sinx-cosx+C1x+C2 y=-sinx+cosx+C1x+2
Acosx+Bsinx x(Acosx+Bsinx) x2(Acosx+Bsinx) (Ax2+sinx+Cxcosx
y′=2xcosx-x2sinx y′=2xcosx+x2sinx y′=x2cosx-2xsinx y′=xcosx-x2sinx
(ax2-bx+c)′=a(x2)′+b(-x)′ (sinx-2x2)′=(sinx)′-(2)′(x2)′ (cosx·sinx)′=(sinx)′cosx+(cosx)′·cosx
y"+y=0的通解是y=C1cosx+C2sinx y"+y=0的通解是y=C1ex+C2e-x y"+6y'+13=0的通解是y=e-3x(C1+C2x) y"+6y'+13=0的通解是y=e-3x(C1cosx+C2sinx)
y=x+sinx y=|x|﹣cosx y=xsinx y=|x|cosx
y=sinx y=-sinx·cosx y=sinx·cosx y=cosx
y′=2xcosx-x2sinx y′=2xcosx+x2sinx y′=x2cosx-2xsinx y′=xcosx-x2sinx
) A. y′=2xcosx-x2sinx y′=2xcosx+x2sinx y′=x2cosx-2xsinx y′=xcosx-x2sinx