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`        In ðŸ”º ABC,  2ca.sin(A-B+C)/2 is equal to... (a) aÂ²+bÂ²-cÂ²                      (b) cÂ²+aÂ²-bÂ²(c) bÂ²-cÂ²-aÂ²                        (D) cÂ²-aÂ²-bÂ²`
2 years ago

Arun
23312 Points
```							A+B+C=Piso A+C = Pi - Bso here it will be :Â  2ac.sin(Pi/2 -B) = 2ac.cosBby cosine rule, we have: c2+a2-b2Â = 2ac cos BoptionÂ B
```
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