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`        Prove the following : sin25*cos5-cos80*sin70=sin15*cos5`
one year ago

Deepak Kumar Shringi
4397 Points
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one year ago
1815 Points
```							We use 2sin25*cos 5= sin30+sin20And 2sin70cos80= sin30-sin10Subtract2*LHS= sin20+ sin10= 2sin15cos5So LHS= RHS
```
one year ago
Arun
23479 Points
```							Dear student This question is purely an application of 2 sinA cos B Now 1/2 (sin 30 + sin 20)  - 1/2 (sin 150  - sin 10) 1/2 ( sin 20 + sin10) = 1/2 * 2 sin 15 cos 5 = sin 15 cos 5 Hope it helps
```
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