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```
cos 2 A+cos 2 B+cos 2 C=cosB×cosC+cosC×cosA+cosA×cosB then prove that the trangle are equilateral
cos2A+cos2B+cos2C=cosB×cosC+cosC×cosA+cosA×cosB then prove that the trangle are equilateral

```
2 years ago

2074 Points
```							let cosA=x, cosB=y, cosC=zthe given equation becomes (x-y)^2+(y-z)^2+(z-x)^2=0so cosA=cosB=cosC implying that A=B=C, therefore the triangle is equilateral
```
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