a) Solve the given differential equation by Separation of variables.
sec2xdy+cscydx=0
b)Solve the following Differential Equation
(y2+3xy)dx=(4x2+xt)dy, y(1)=1
c)Determine whether the following Differential Equation is exact. If exact, solve
(1-2x2-2y)dy/dx=4x3+4xy
ITS URGENT NEED WITHIN 24 hours