An L$-$R$-$C series circuit has a $1\mathrm{.}80-$H inductor, a $0\mathrm{.}900-$F capacitor, and a $300-$ resistor. The source has terminal rms voltage Vrms $=60\mathrm{.}0$ V and variable angular frequency $.($a$)$ What is the resonance angular frequency of the circuit?$($b$)$ What is the rms current through the circuit at resonance, Irms$-0?($c$)$ For what two values of the angular frequency, and $,$ is the rms current half the resonance value?