यदि x + (1)/(x) = 2 cos theta, तब x^(3) ...

यदि `x + (1)/(x) = 2 cos theta`, तब `x^(3) + (1)/(x^(3))` बराबर है-

A

`cos 3 theta`

B

`2 cos 3 theta`

C

`(1)/(2) cos 3 theta`

D

`(1)/(3) cos 3 theta`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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