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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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Knowledge Check

  • If x sin theta =2y cos theta and 2x sec theta-y cosec theta=3 , then the value of x^2+4y^2 is

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    A
    `cos theta`
    B
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    C
    `sin 2 theta`
    D
    `cos 2 theta`

  • If x=(2 sin theta)/(1+ sin theta + cos theta) then the value of (1+ sin theta - cos theta)/(1+ sin theta)

    A
    `-x/2`
    B
    `x/2`
    C
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    D
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