Express: `((x+sqrt(x^2+1))^6+ (x-sqrt(x^2+1))^6)` as a polynomial in x

The expression (x+sqrt(x^3-1))^7+(x-sqrt(x^3-1))^7 is a polynomial of degree

The expression (sqrt(2x^2+1)+sqrt(2x^2-1))^6 + (2/(sqrt(2x^2+1)+sqrt(2x^2-1)))^6 is polynomial of degree

The expression (sqrt(2x^2+1)+sqrt(2x^2-1))^6 + (2/(sqrt(2x^2+1)+sqrt(2x^2-1)))^6 is polynomial of degree

The expression (1)/( sqrt( 3x +1)) [ ( ( 1+ sqrt( 3x + 1))/(2))^(7) - (( 1- sqrt ( 3x +1))/(2))^(7)] is a polynomial in x of degree eual to

The no. of terms in (x + sqrt(x^2 - 1))^6 + (x -sqrt(x^2 - 1))^6

The expression (sqrt(2x^2+1)+sqrt(2x^2-1))^6+(2/((sqrt(2x^2+1)+sqrt(2x^2-1))^))^6 is polynomial of degree 6 b. 8 c. 10 d. 12

In the expansion of (x+sqrt(x^(2)-1))^(6)+(x-sqrt(x^(2)-1))^(6) the number of terms is