Lt h¡ú0 sec (x+h)-sex (x)/h=?
this is explained here:
http://socratic.org/questions/how-do-you-use-limit-to-prove-the-derivative-of-secx-secxtanx
google is your friend. Use it.
http://socratic.org/questions/how-do-you-use-limit-to-prove-the-derivative-of-secx-secxtanx
google is your friend. Use it.