1.

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

Answer»

`2^ncos(npi//2)`
`2^(n+1)COS(npi//2)`
`2^(n-1)SIN(npi//6)`
`2^(n+1)sin(npi//3)`

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