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Which of the following functions are strictly decreasing on (0,pi/2)
Applications of Derivatives | CBSE | Class 12 | Exercise 6.2 | Maths | NCERT
Which of the following functions are strictly decreasing on (0,pi/2)

(C) 

(D) 

SOLUTION:

(C) 

 

Since 

  

For   

 

Therefore,  is strictly decreasing on 

For   

 

Therefore,  is strictly increasing on 

Hence,  is neither strictly increasing not strictly decreasing on 

(D) 

  > 0

Therefore,  is strictly increasing on 

i

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