Find the first cofefficients

f(x)=7/(1+64x^2)= summation n=0 to infinity (c_n)(x^n)

c_1

c_2

c_3

c_4

I really don't know how to do this. I know you could right it as summation n=0 to infinity 7*(-1)^n (64x^2)^n i'm not even sure that it is even right. please help