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If x=2 cos theta then the value of (x^(...

If `x=2 cos theta ` then the value of `(x^(3) -2x +6)` is-

A

`(sin 4 theta)/(sin theta)`

B

`(2 sin ^(2) 2 theta)/(sin theta)`

C

`4 cos ^(2) theta (2 cos theta -1)`

D

none of these

Text Solution

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The correct Answer is:
D
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