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`        Sin5xcos3x..plxz help me to get out of this question...answer fast....`
6 months ago

## Answers : (2)

Saurabh Koranglekar
3295 Points
```							Dear studentSin ( a+b)+ sin ( a-b)= 2 sin a cos bOn simplification of the questionSin 2x = sin 4 x2sin x cos x = 2 sin x. Cos x. Cos 2xCos 2x = 1Now you can solve furtherRegards
```
6 months ago
Arun
23357 Points
```							Dear student  multiply by 2 in LHS and RHS then it becomes after using the formula of 2 sinAcosB sin 8x + sin 2x = sin 8x + sin 4x hence sin 2x = sin 4x sin2x (1 – 2 cos2x) = 0 hence sin2x = 0 or cos2x = ½ 2x = n* pi      or    2x = 2 n* pi ± pi/3 x = n * pi/2     or    x = n * pi ± pi/6
```
6 months ago
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### Course Features

• 731 Video Lectures
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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