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If the arithmetic mean of the roots of t...

If the arithmetic mean of the roots of the equation `4cos^(3)x-4cos^(2)x-cos(pi+x)-1=0` in the interval `[0,315]` is equal to `kpi`, then the value of `k` is

A

`10`

B

`20`

C

`50`

D

`80`

Text Solution

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The correct Answer is:
C
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