sir, plz tell me how   
if f(x)=cos3x it is neither increasing nor decreasing on(0,pie/2)

The word, 'pie' refers to something we have a peace of to eat.
The word used here is pi, a name of a Greek letter, and it is 3.1415...

The value of 3x is 3*pi/2, and that is the minimum of the cos(x) curve.
At this point, the curve has slope 0, so it is neither increasing or decreasing.


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