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If x+1/x =2 cos theta, then (x^(3) + (1)...

If `x+1/x =2 cos theta, `then `(x^(3) + (1)/(x^(3)))`is equal to-

A

`2 cos 3 theta`

B

`3 cos 3 theta`

C

`2 cos 2 theta`

D

`3 cos 2 theta`

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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 7
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