Z = SQR (R² + XL²) Where: Z = Impedance (ohm) R = Resistance (ohm) XL= Inductance Reactance (ohm)
http://wiki.answers.com/Q/What_is_the_formula_for_...

Euler's formula was proven for the first time by Roger
http://www.chacha.com/question/whatisformulafor...

The resonant frequency f = 1/SQRT(L *C) For a parallel LC circuit, the equivalent total Reactance is. Xt = 1 / (1/jXC) + (1/jXL) which in turn is. Xt = (jXL * jXC) / (jXL + jXC)
http://answers.yahoo.com/question/index?qid=201310...

its Z= then inside a square root sign.R squared(dont know how to make the little 2) plus X (little L) squared.
http://answers.yahoo.com/question/index?qid=201009...
