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`        What is the general solution of tan7x.tan3x=-1? What are its principle solutions?`
one year ago

Arun
23359 Points
```							 we can write it as  sin 7x sin3x + cos 7x cos 3x = 0hence cos (7x- 3x ) = 0 4x = 2n* pi ± pi/2 hence x = npi/2 ± pi/8 RegardsArun (askIITians forum expert)
```
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