" If "alpha,beta" are the roots of the "x^(2)-2x+4=0" then "alpha^(n)+beta^(n)" is equal to "

If alpha and beta are the roots of x^(2)-2x +4=0 then alpha^(n) + beta^(n) is equal to

If alpha,beta are the roots of x^(2)-2x+4=0 then alpha^(n)+beta^(n) is

If alpha and beta are the roots of the equation x^(2)-2x+4=0, then alpha^(9)+beta^(9) is equal to

If alpha and beta are the roots of x^2-2x+4=0 , then alpha^n+beta^n is equal to (a) 2^ndotcos((npi)/3) (b) 2^ndotcos(((n-1)pi)/3) (c) 2^(n+1)dotcos((npi)/3) (d) 2^(n+1)dotcos(((n+1)pi)/3)

If alpha and beta are the roots of x^2-2x+4=0 , then alpha^n+beta^n is equal to (a) 2^ndotcos((npi)/3) (b) 2^ndotcos(((n-1)pi)/3) (c) 2^(n+1)dotcos((npi)/3) (d) 2^(n+1)dotcos(((n+1)pi)/3)