First compute f'(x) using first derivative.
Then find critical points using f'(x)=0.
Critical points are= pi/2 and 3pi/2
Check sign of f\'(x) in each intervals.
f\'(pi/4) = negative
So, in (0,pi/2) and (3pi/2 , 2pi) the function is decreasing. [because f\...
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