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Question

Is the equation sec2θ=4xy(x+y)2 possible for real
value of x and y?
If not, then find out a relation between x and y so that it may be possible.

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Solution

Since sec2θ1, we have from the given relation,
4xy(x+y)21 or (x+y)24xy.
or (x+y)24xy0 or (xy)20.
Above is possible only when x=y but x0.

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