3. Locate and classify the singular points to the differential equations (i.e. ordinary points, regular and irregular singular points). Briefly explain your conclusion. Extra remark: Remember to understand this idea you have to put the equation in "standard form". (a) xy" + (1-e)y' - xy = 0 (b) sin (2) y" + xy + y = 0 with 0≤x≤/2. Determine the nature of the singular point at x= 0. You need to consider the limit 0 of the equation when put in "standard form".