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`        If sinx+siny=3(cosy-cosx)thttn what is the value of sin3x÷sin3y`
one year ago

## Answers : (1)

Arun
23521 Points
```							From the given relation, we can write, 3 cos x + sin x = 3 cos y - sin yput r cos theta=3 and r sin theta = 1 , then we get , r = sqrt( 10), tan theta= 1/3so r cos ( x - theta)= r cos (x+theta)x = - yclearly x = - y satisfies the equationtherefore, x = - yso 3x = -3ysin 3x = sin (-3y) = - sin 3ysin 3x / sin 3y = -1
```
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