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question mark

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?

vineet nimesh , 11 Years ago
Grade
anser 1 Answers
yaswanth
answer may be wrong
Last Activity: 11 Years ago
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