The cofficient of `x^6` in the tower series expansion of `(x^4 - 12x^2 + 7)/((x^2 + 1)^3)` is

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is :

Cofficients of x^(6)y^(3) in the expansion of (x+y)^(9) is

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is

The coefficient of x^4 in the expansion of (1+x-2x^2)^7 is

The coefficient of x^(4) in the expansion of (1+x-2x^(2))^(7) is :

Find the coefficient of x^(3) in the power series expansion of (5x+6)/((x+2)(1-x)) specifying the region in which the expansion is valid.

Find the coefficient of x^(3) in the power series expansion of (5x+6)/((x+2)(1-x)) specifying the region in which the expansion is valid.

The cofficient of x^5 in the series e^(-2x) is ………………….. .