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Grade 12th passTrigonometry

For what real values of x and y is the equation possible?

Question image for For what real values of x and y is the equation po
Profile image of Ananya Jain
11 Years agoGrade 12th pass
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1 Answer

Profile image of Nicho priyatham
ApprovedApproved Tutor Answer11 Years ago
ONLY WHEN (X,Y)=(1,1)
applying AM>(or equal)GM we get
4xy/(x+y)2belongs to (0,1]
where as secx belongs to R-[-1,1]
so both LHS nRHS can be equal only wn LHS=RHS=1 so x=y=1
PLZ APPROVE IF USEFUL

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