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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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A quadrilateral ABCDABCD in which AB=a,  BC=b,  CD=cAB = a,\;BC = b,\;CD = c and DA=dDA = d is such that one circle can be inscribed in it and another circle can be circumscribed about it, then cos⁡A\cos A is equal to
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Correct option: B
ad−bcad+bc\frac{{ad - bc}}{{ad + bc}}
Option B (ad−bcad+bc\frac{{ad - bc}}{{ad + bc}}) is correct because it is the expression derived from the given conditions of a cyclic quadrilateral with an inscribed circle.

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