Let f(x)=cosp x where p=[a] where [x] is the integral part of x, If the period of f(x) is π, then a∈
[4,5]
[4,5)
(4,5]
(4,5)
2πp=π⇒p=2⇒p=4 a=4⇒a∈[4 , 5)