- #1
titowakoru
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Homework Statement
The question I am trying to answer requires me to find the following:
dN/dS ∝ S^−5/2/cosh(r/R)
and I am giving the follwing equation in the question.
A=4πR^2 sinh^2〖(r/R)〗
The Attempt at a Solution
Right I know how to get the S^-5/2 in the top half of the equation.
I also understand that the cosh part comes from the differentiation of A. The problem I have is after applying the product rule to A I end up with this:
dA/dr=8πRsinh^2 (r/R)+ 8πR^2 sinh(r/R)cosh(r/R)
I am stuck on how the terms cancel to leave me with cosh(r/R) so i can reach the equation required.