12. In the linear differential equation of the following form, if R(x)=0, then 1 point the differential equation will become Po(aly")+ Pi(aly"-4...... +Pri(x)y + Pr(x)y = R(x) O Exact Homogeneous O Non-Homogeneous O Non Linear3. Obtain the differential equation of the family of circle with center on the 1 point x-axis ? * yy" + (y' )2 - 1=0 xy" + (y' )' +1=0 O Option 1 O Option 2 yy" + (y')+1=0 xy'+ (y)' - 1=0 O Option 3 O Option 4