Nilai x yang memenuhi (sin x)/(1-cos x)=(1+cos x)/(cos

Nilai x yang memenuhi (sin x)/(1-cos x)=(1+cos x)/(cos (1)/(2) x) adalah .... (A) {(pi)/(2)+4 k pi ; (5)/(3) pi+4 k pi}_(k in {Z)) (B) {(pi)/(2)+4 k pi ; (5)/(4) pi+4 k pi}_(k in {Z)) (C) {(pi)/(3)+2 k pi ; (5)/(3) pi+3 k pi}_(k in {Z)) (D) {(pi)/(3)+3 k pi ; (4)/(3) pi+4 k pi}_(k in {Z)) (E) {(pi)/(3)+4 k pi ; (5)/(3) pi+4 k pi}_(k in {Z))