Find the intervals in which the following functions are strictly increasing or decreasing:
Find the intervals in which the following functions are strictly increasing or decreasing:

(e) 

SOLUTION:

(e) Given: 

 

  

  

  

Here, factors  and  are non-negative for all 

Therefore,  is strictly increasing if 

 

 

And  is strictly decreasing if 

 

 

Hence,  is strictly increasing in  and  is strictly decreasing in