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`        If a + b + c is equals to 180 then cos square A + cos square b + cos square C is equals to`
7 months ago

Vikas TU
10470 Points
```							Solving RHS2cosAcosBcosC =(2cosAcosB)cosC=(cos(A+B) + cos(A-B))cosC=cos(pi-C)cosC + cos(A-B)cos(pi-(A+B))=-2cos^2C - 2cos(A+B)cos(A-B)=-cos^2C - cos^2A + sin^2Bso,1 - 2cosAcosBcosC = 1 + cos^2C + cos^2A - sin^2B= 1 - sin^2B + cos^2C + cos^2A= cos^2B + cos^2C + cos^2A
```
7 months 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