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## Homework Statement

Hey guys, I've recently completed a module on circuit theory and I came across this particular slide on RL circuits (High Pass Filter) which puzzles me:

High Pass: RL Circuit, Low Pass: RC Circuit

The phase is given by:

tan ψ = (ωL/R)

but the very next line it is written as the reciprocal:

tan ψ = (R/ωL)

And the corresponding bode plots are based on the second (inverted) phase..