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Which one of the following statements is...

Which one of the following statements is correct ?

A

`(costheta)^(1/2)gecos(theta/2)`

B

`(costheta)^(3/4) le cos(3theta/4)`

C

`cos(5theta/6) ge (cos theta)^(5/6)`

D

`cos((7theta)/8) ge (cos theta)^(7/8)`

Text Solution

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The correct Answer is:
A, C
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