In the expansion of (1-x ^ 2) (1 + 2x ^ 2) ^ 12, what is the coefficient of x ^ 8? The correct answer is 6160

In the expansion of (1-x ^ 2) (1 + 2x ^ 2) ^ 12, what is the coefficient of x ^ 8? The correct answer is 6160


Do you know the formula of binomial expansion? (a + b) ^ n = C (n, 0) * a ^ n + C (n, 1) * a ^ (n-1) * B + C (n, 2) a ^ (n-2) * B ^ 2 + + C(n,m)a^(n-m)b^m + …… +C (n, n) B ^ n so (1 + 2x ^ 2) ^ 12 = 1 + C (12,1) * (2x ^ 2) + C (12,2) (2x ^ 2) ^ 2 + C (12