An alternating E$.$M$.$F$.E$ sin $pt$ is applied to a circuit at $t=0.$ Given the equation for the current $i$ as

$L\frac{d^{2}i}{d{t}^2}+R\frac{di}{dt}+\frac{i}{C}=$pEcospt, find the current i when $(i)C{R}^2>4L,$

$($ii