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`        I need help solving this question. I’ didn't get how to do it. `
one year ago

Arun
24739 Points
```							cos(A-B)/cos(A+B) + cos(C+D)/cos(C-D) =0or cos(A-B)/cos(A+B) = -cos(C+D)/cos(C-D) .Applying componendo and dividendo.{cos(A-B)+cos(A+B)}/{cos(A-B)-cos(A+B)} ={-cos(C+D)+cos(C-D)}/{-cos(c+D)-cos(C-D)}.2cosA.cosB/2sinA.sinB=2sinC.sinD/(-2cosC.cosDor cotA.cotB = -tanC.tanDor 1/(tanA.tanB) = -tanC.tanD.by crossmultiplecation.1= -tanA.tanB.tanC.tanDor tanA.tanB.tanC.tanD = -1 ,proved.
```
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