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`        Sin²A/2+sin²B/2+sin²C/2=1-2sinA/2sinB/2sinC/2Need to prove this formula `
one year ago

Arun
23381 Points
```							given A+B+C=180LHS      SIN²A/2+SIN²B/2+SIN²C/2            1/2(2SIN²A/2+2SIN²B/2+2SIN²C/2)            1/2(1-COSA+1-COSB+1-COSC)            1/2(3-(COSA+COSB+COSC)            1/2(3- (2COS (A+B/2)COS(A-B/2)+COSC)            1/2(3- (2COS(90-C/2)COS(A+B/2)+C0SC)            1/2(3- (2SINC/2COS(A-B/2)+1-2SIN²C/2)            1/2(3-1-2SINC/2(COS(A+B/2)-SINC/2)            1/2(2-2SINC/2(COS(A-B/2)-SIN (90-A+B/2)  (SIN90-Ф)= COSФ)            1/2(2-2SINC/2(COS(A-B/2)-COS(A+B/2)            1/2(2-2SINC/2(2SINA/2SINB/2)            1/2(2-4SINA/2SINB/2SINC/2)            1-2SINA/2SINB/2SINC/2            RHS
```
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