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If alpha,beta are the roots of an equati...

If `alpha,beta` are the roots of an equation `x^2-2xcostheta+1=0` then the equation having `alpha^n` and `beta^n` is

A

`x^2-2x cos n phi-1=0`

B

`x^2 -2x cos n phi +1=0`

C

`x^2 -2x sin n phi +1=0`

D

`x^2+2x cos n phi -1=0`

Text Solution

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The correct Answer is:
B
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