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Grade 12th PassTrigonometry

Give me the proof for the following inequality
(sinA/A)

Profile image of Balamohan
8 Years agoGrade 12th Pass
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1 Answer

Profile image of Arun
8 Years ago
Dear student
 
 
Let f(x)= x-sinx
f'(x)= 1-cosx
We know that -1
=> 1>= -cosx>= -1
=> 2>=1-cosx>= 0
=> f'(x)>=0
And f(0)=0
=> f(x)>=0
=> x>sinx.
 
Hope it helps
 
Regards
Arun (askIITians forum expert)

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