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The ratio of the greatest value of 2-cos...

The ratio of the greatest value of `2-cos x+s in^2x` to its least value is `7/4` (2) `9/4` (3) `(13)/4` (4) `5/4`

A

`1//4`

B

`9 //4`

C

`13//4`

D

none

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The correct Answer is:
C
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