If `a = (sqrt3 + sqrt2)/(sqrt3-sqrt2)` then the value of `2a^4 - 21 a^3 + 12 a^2 - a + 1` is

1/(sqrt3 + sqrt2) + 1/(sqrt3 -sqrt2)=

(sqrt3+sqrt2)^(4)- (sqrt3-sqrt2)^(4) =

If a= (sqrt3 - sqrt2)/(sqrt3 + sqrt2), b = (sqrt3 + sqrt2)/(sqrt3 - sqrt2) then what is the value of a^2/b+b^2/a ?

If a=(sqrt3+ sqrt2)/(sqrt3- sqrt2) and b=(sqrt3- sqrt2)/(sqrt3+sqrt2) , then what is the value of a^2+b^2-ab ?