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f′(x)=cosx﹣sinx f′(x)=cosx+sinx
f′(x)=﹣cosx+sinx f′(x)=﹣cosx﹣sinx
-2x+c1cosx+c2sinx 2x+c1cosx+c2sinx -2x+cosx+sinx -2x+c1cosx+sinx
f′(x)=cosx﹣sinx f′(x)=cosx+sinx
f′(x)=﹣cosx+sinx f′(x)=﹣cosx﹣sinx
x=0是f(x)的极小值点. x=0是f(x)的极大值点. 曲线y=f(x)在点(0,f(0))左侧邻近是凹的,右侧邻近是凸的. 曲线y=f(x)在点(0,f(0))左侧邻近是凸的,右侧邻近是凹的.
-2excosx -2exsinx 2exsinx -2ex(sinx+cosx)
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
(ax2-bx+c)′=a(x2)′+b(-x)′ (sinx-2x2)′=(sinx)′-(2)′(x2)′ (cosx·sinx)′=(sinx)′cosx+(cosx)′·cosx
y=sinx y=-sinx·cosx y=sinx·cosx y=cosx
f′(x)=cosx﹣sinx f′(x)=cosx+sinx f′(x)=﹣cosx+sinx f′(x)=﹣cosx﹣sinx
ex(cosx+sinx) ex(cosx﹣sinx) ﹣ex(cosx+sinx) ex(sinx﹣cosx)