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In triangle A B C , if |1, 1, ,1,cotA/2,...

In triangle `A B C` , if `|1, 1, ,1,cotA/2,cotB/2,cotC/2,tanB/2+tanC/2,tanB/2+tanA/2,tanA/2
` +tanB/2|` then the triangle must be a. equilateral b. isosceles c. obtuse angled`` d. none of these

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CENGAGE ENGLISH-DETERMINANTS-All Questions
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  6. If xi=ai bi c+i,i=1,,23 are three-digit positive integer such that ...

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