Answer Happy

Q18
PLEASE answer all parts of the question. PLEASE SHOW and clearlyEXPLAIN all parts of the question and HIGHLIGHT the final solution.If the answer is correct I will upvote!
Find the first four nonzero terms in a power series expansion of the solution to the given initial value problem. 3y" - e - e4xy' + 4( cos x)y=0; y(0)= -1, y'(0) = -1 y(x) = + (Type an expression that includes all terms up to order 3.) + ...