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If x = cos theta + isin theta, then the ...

If x = cos `theta` + isin `theta`, then the value of `x^(n) + (1)/(x^(n))` is

A

`2 cos n theta`

B

`2 isin n theta`

C

`2^(n) cos theta`

D

`2^(n) isin theta`

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The correct Answer is:
A, B, C
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