yu gotta watch that 1/4x, it goto infinity as x gotu 0
but sine(sumthun) go round in cycles: sine(y) same as sine(y +2pi)
if yu stae awae from x=0 & look at big x, (1/4x) gotu 0 & sine goto 0
left side: sine(-x)=-sine(x) ...anser negativ but same shape
hole kerv symmetrik bout (0,0)