对y=(cosx)^x求导数.
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对y=(cosx)^x求导数.
题目是y等于cosx的x次方
题目是y等于cosx的x次方
![对y=(cosx)^x求导数.](/uploads/image/z/14910695-71-5.jpg?t=%E5%AF%B9y%3D%EF%BC%88cosx%EF%BC%89%5Ex%E6%B1%82%E5%AF%BC%E6%95%B0.)
y = [cos(x)]^x = e^[xlncos(x)],
y' = e^[xlncos(x)]*[xlncos(x)]' = e^[xlncos(x)]*[lncos(x) + x/cos(x)*(cos(x))']
= e^[xlncos(x)]*[lncos(x) + x/cos(x)*(-sin(x))]
= e^[xlncos(x)]*[lncos(x) - xtan(x)]
= [lncos(x)-xtan(x)]*[cos(x)]^x
y' = e^[xlncos(x)]*[xlncos(x)]' = e^[xlncos(x)]*[lncos(x) + x/cos(x)*(cos(x))']
= e^[xlncos(x)]*[lncos(x) + x/cos(x)*(-sin(x))]
= e^[xlncos(x)]*[lncos(x) - xtan(x)]
= [lncos(x)-xtan(x)]*[cos(x)]^x