y=e^(-x)可以看做y=e^t和t=-x的复合,根据复合函数求导的法则,先将y对t求导得e^t,然后t对x求导得-1,两个导数相乘,并将结果中t换成-x,从而(e^-x)'=e^(-x)*(-1)=-e^(-x)
拓展资料:
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常用的导数公式
y=c(c为常数),y'=0
y=x^n,y'=nx^(n-1)
y=a^x,y'=lna*a^x;y=e^x,y'=e^x
y=logax(a为底数,x为真数); y'=1/(x*lna);y=lnx,y'=1/x
y=sinx y'=cosx
y=cosx y'=-sinx
y=tanx y'=1/(cos(x))^2
y=cotx y'=-1/sin^2x
y=arcsinx y'=1/√(1-x^2)
y=u^v ==> y'=v' * u^v * lnu + u' * u^(v-1) * v
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