Find the coefficient of x ^ 2 term in (x ^ 2 + X-2) ^ 6 expansion

Find the coefficient of x ^ 2 term in (x ^ 2 + X-2) ^ 6 expansion


In the sixth power expansion of (x ^ 2 + X-2) = (x + 2) (x-1) (x + 2), the constant term is the sixth power of 2, the coefficient of X is the fifth power of C61 * 2, the coefficient of x square is the fourth power of C62 * 2, (6 is in the lower right corner of C, 2 is in the upper right corner. The same below)