1.

The incircle touches side BC of triangle ABC at D and ID is produced to H so that DH=s, where s and I are the semi-perimeter and incentre of triangle ABC respectively. If HBIC is cyclic, then cot(A4) is equal to

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The incircle touches side BC of triangle ABC at D and ID is produced to H so that DH=s, where s and I are the semi-perimeter and incentre of triangle ABC respectively. If HBIC is cyclic, then cot(A4) is equal to



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