Is this it: ?
It's kind of hard to tell from what you've written. Anyway, assuming that it is, to differentiate with respect to , treat every other variable as constants.
So:
Hi,
I am trying to differentiate
(N*k/3)*[T-(Q/6.7)*arctan(6.7T/Q)]
with respect to T.
Apparently the answer is
(N*k/3)*[(6.7T/Q)^2 / 1 + (6.7T/Q)^2]
I am getting
(N*k/3)*[1/(1+(6.7T/Q)^2)]
Could someone give me breakdown of how this is done and perhaps point out where I have gone wrong?
Thanks
(P.S. sorry for not being able to use MATH)