1.

Let f(x) = cos ((pi)/(x)) xne 0 then assuming k as an integer ,

Answer»

F(x) INCREASE in the interval `((1)/(2K+1),(1)/(2k))`
f(x) decreases in the interval `((1)/(2k+1),(1)/(2k))`
f(x) decrease in the interval `((1)/(2k+2),(1)/(2k+1))`
f(x) increases in the interval `((1)/(2k+2),(1)/(2k+1))`

Answer :A::C


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