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Choose the correct answer from the bracket. The function f(x)=cosx is strictly decreasing in the interval _______a)`((-pi)/2,pi/2)` b)`(0,2pi)` c)`(0,pi)` d)`(-pi,pi)`

A

`((-pi)/2,pi/2)`

B

`(0,2pi)`

C

`(0,pi)`

D

`(-pi,pi)`

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