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Homework Statement
I cannot write out the equation clearly so I am attaching a file.
Homework Equations
The Attempt at a Solution
sin x= x x^3/3! + x^5/5!  x^7/7! + ....
sinx/(x)= 1 x^2/3! + x^4/5!  x^6/7!  x^26/27! + ...
(1)^k x^(2k) / (2k+1)! = g^(2k)(0) x^(2k)/(2k)!
g^(2k)(0)= (1)^(k)/(2k+1)
g^(2*13)(0)= (1)^(13)/(26+1)
g^(26)(0)= 1/27
Is this correct? Thank you!
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