- #1

silverfury

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- 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