Find the derivative of f(x)=ln(secx+tanx)f(x) = \ln(\sec x + \tan x)f(x)=ln(secx+tanx).
secx\sec xsecx
tanx\tan xtanx
secxtanx+sec2x\sec x \tan x + \sec^2 xsecxtanx+sec2x
secxtanx+sec2xsecx+tanx\frac{\sec x\tan x + \sec^2 x}{\sec x + \tan x}secx+tanxsecxtanx+sec2x