NCERT 6.2 ques no.17

Asked by rahulnoida | 8th Jul, 2011, 10:09: PM

Expert Answer:

The question is to prove that the function f given by f(x)=log cosx is strictly decreasing on(0,) and strictly increasing on (,).
Sol: f(x)=log cosx
   
   
we know that tanx>0 for x
 

Answered by  | 8th Jul, 2011, 09:16: PM

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