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

shaon0

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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.
 

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