 #1
silverfury
 1
 0
 Homework Statement:
 I have tried differentiating many times in order to find a simpler diffrential eq to solve it further but didn’t have any luck there. Pls help
 Relevant Equations:

To prove:
ln(sec x + tan x) = x + x^3/6 + x^5/24 ......
I tried diffrentiating upto certain higher orders but didn’t find any way.. is there a trick or a transformation involved to make this task less hectic? Pls help