求导 y=ln(secx+tanx)

问题描述:

求导 y=ln(secx+tanx)
=[1/(secx+tanx)]*(secxtanx+(secx)^2)
=secx

=[1/(secx+tanx)]*(secxtanx+sec²x)
=(secxtanx+sec²x)/(secx+tanx)
=secx(secx+tanx)/(secx+tanx)
=secx