Thanks a lot for the solution

Hi

c0+c1*x+c2*x^2+c3*x^3+(1/12*a*R^2*c2-2/3*a*c0)*x^4+(1/20*a*R^2*c3-5/24*a*c1)*x^5

+(1/360*a^2*R^4*c2-1/45*a^2*R^2*c0-1/10*a*c2)*x^6+(1/840*a^2*R^4*c3-5/1008*a^2*R^2*c1-7/120*a*c3)*x^7+

(1/20160*a^3*R^6*c2-1/2520*a^3*R^4*c0-5/1008*a^2*R^2*c2+8/315*a^2*c0)*x^8+

(1/60480*a^3*R^6*c3-5/72576*a^3*R^4*c1-13/6048*a^2*R^2*c3+5/896*a^2*c1)*x^9+O(x^10) 

This is the expression that I have, I want to write it as f(x)*c0+g(x)*c1+h(x)*c2+k(x)*c3

f,g,h,k will be some combination of the powers of x in the above expression