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```
Find cot(a/2) + cot(b/2) + cot(c/2), if a + b + c = 180.
Find cot(a/2) + cot(b/2) + cot(c/2), if a + b + c = 180.

```
2 years ago

## Answers : (1)

Diksha singh
13 Points
```							If ABC is a triangle A + B + C = π => A/2 + B/2 = π/2 - C/2 => tan (A/2 + B/2) = tan (π/2 - C/2) => (tan A/2 + tanB/2) / (1 - tan A/2 tan B/2) = cot C/2 => (cot A/2 + cot B/2) / (cot A/2 cot B/2 - 1) = cot C/2 => cot A/2 + cot B/2 + cot C/2 = cot A/2 cot B/2 cot C/2
```
2 years ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions