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Find the intervals of decrease and incre...

Find the intervals of decrease and increase for the function `f(x)="cos" pi/x`-
(k being a non-negative interger)

A

`(1/(2k+1), 1/(2k))`

B

`(1/(2k+2), 1/(2k))`

C

`(1/(2k+2), 1/(2k+1))`

D

`(1/(2k), 1/(2k+1))`

Text Solution

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The correct Answer is:
A, C
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