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```
cos a + cos b + cos c = sin a +sin b+ sin c =0 then value of cos 3a + cos 3b+ cos 3c is....Please show steps

```
2 years ago

Deepak Kumar Shringi
4404 Points
```							cos3a+cos3b+cos3c=4cos3a-3cosa+4cos3b-3cosb+4cos3c-3cosc=4(cos3a+cos3b+cos3c)-3(cosa+cosb+cosc)if x+y+z=0 then x3+y3+z3=3abc=12cosa cosb cosc
```
2 years ago
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### Course Features

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