唧唧急y=tanx- 1/lgx的导数

y = tanx - 1/lgx
= tanx -1/(lnx/ln10)
= tanx - (ln10)/lnx
dy/dx = sec²x + (ln10)/[x(lnx)²]
= sec²x + 1/[x(lnx)(lgx)]

y'=(secx)2-(-1/xlogx)=(secx)2+1/xlogx

y=tanx- 1/lgx的导数
tanx ' = sec²x
1 / Lgx = - Ln10 / (xLn²x)
y ' = sec²x + Ln10 / (xLn²x)