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The arithmetic mean of the roots of the ...

The arithmetic mean of the roots of the equation `4cos^3x-4cos^2x-cos(315pi+x)=1` in the interval `(0,315pi)` is equal to (A)`50pi` (B) `51pi` (C)`100pi` (D) `315pi`

A

`50pi`

B

`51pi`

C

`100pi`

D

`315pi`

Text Solution

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The correct Answer is:
B
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