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why (a+b)/2>=(ab) 1/2 is not applicable to this problem? 8cos 2 x +18sec 2 x minimum value x is R answer is 26 but when i apply above formula this comes out to be 24.what are the limitations of above formula?

why (a+b)/2>=(ab)1/2
is not applicable to this problem?
8cos2 x +18sec2 x minimum value x is R
answer is 26 but when i apply above formula this comes out to be 24.what are the limitations of above formula?
 

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1 Answers

yaswanth
36 Points
7 years ago
answer may be wrong

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