y= (cos x)^x,求dy/dx
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y= (cos x)^x,求dy/dx
y= (cos x)^x,求dy/dx
y= (cos x)^x,求dy/dx
最好的办法是求对数:
lny=xlncosx,两边求导数得:
y'/y=lncosx-x(sinx/cosx)=lncosx-xtanx
所以:y'=y(lncosx-xtanx)
=(cos x)^x (lncosx-xtanx)
e^lncosx^x=(cosx)^x乘(-x sin x/cosx +lncos x)
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