dy/dx=2e^x-e^(-x)
dy/dx>0 -->2e^x-e^(-x)>0 -->e^(x+In2)>e^-x
-->x+In2>=-x-->x>=-(In2)/2
所以x>=-(In2)/2遞增,xf(x)=2*√(1/2)+√2=2√2
無最大值
用二階導(dǎo)數(shù)求y=2e^x+e^負(fù)x.的極值,
用二階導(dǎo)數(shù)求y=2e^x+e^負(fù)x.的極值,
數(shù)學(xué)人氣：630 ℃時間：2020-06-22 21:07:19
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