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-2x+c1cosx+c2sinx 2x+c1cosx+c2sinx -2x+cosx+sinx -2x+c1cosx+sinx
y'=2x+cosx y'=x2cosx y'=2xcosx y'=2xsinx+x2cosx
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
y=sinx+cosx+C1x+C2 y=-sinx-cosx+C1x+C2 y=sinx-cosx+C1x+C2 y=-sinx+cosx+C1x+2
-cosx+c cosx+c 1/2(sin2x/2-x)+c 1/2(2sin2x-x)+c
B≥2fx B≥fs fs≥B≥fx fs-fx≥B≥fx
(ax2-bx+c)′=a(x2)′+b(-x)′ (sinx-2x2)′=(sinx)′-(2)′(x2)′ (cosx·sinx)′=(sinx)′cosx+(cosx)′·cosx
fs≥2fx fs≥fx fs≤fx fs≤2fx