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Let y = cosx (cosx - cos 3x). Then y is...

Let `y = cosx (cosx - cos 3x)`. Then y is

A

`ge 0` only when `x ge 0`

B

`le 0`, for all real x

C

`ge 0` for all real x

D

`le 0` only when `x le 0`

Text Solution

Verified by Experts

The correct Answer is:
c
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