Hello, arze!
;
I'll take a guess . . . but it's pretty far-fetched.
Identity: .
. . . . . . .
We have: .
Multiply by
Now let
Find the length of the curve for the specified portion:
, ; between and . What is the curve called?
I know the formula:
.
Substituting
Answer gives which i calculated to be the same, but i don't know how they got it in that form.
Thanks