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`        In triangle ABC prove that if alb, c are in AP then Cot(A/2), Cot(B/2), Cot (C/2) are in AP `
one year ago

Arun
22540 Points
```							Dear student Let us assume thatCotA/2 , cot B/2, cotC/2  are in A.P. s(s-a)/delta,  s(s-b)/delta,  s(s-c)/delta        ....A.P.Multiply by delta/s (s-a), (s-b), (s-c)       .......A.P.NowSubtract s -a, -b, -c         .....A.PMultiply by -1 a, b, c        A.P. Hence proved RegardsArun (askIITians forum expert)
```
one year 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