how to differentiate tan? how'd they get the last line? (1 Viewer)

[bos1234]

 

[shaon0]

probs arctan(2pi.f/3)?

 

[Sokolov]

derivative of tan equal secant squared.

problem solved

do your math instead of meth you daft pricks

 

[shaon0]

it should be arctan not tan. its the angle of the transfer function

= arg(2) - arg(3+ j2pif)

= - arctan(2pif/3)

You can also differentiate arctan(2pif/3)/2pi and you'll get the required answer.
At poster above 3unitz, I don't think (sec[x])^2 transformation would do anything.