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JEE Advance - Mathematics (1996 - No. 11)
$${\sec ^2}\theta = {{4xy} \over {{{\left( {x + y} \right)}^2}}}\,$$ is true if and only if
$$x + y \ne 0\,$$
$$x = y,\,x \ne 0$$
$$x = y\,$$
$$x \ne 0,\,y \ne 0$$
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