Purchase mobileappIcon Download our Mobile App
Call Us at 011-40705070  or  
Click to Call
Select your Board & Class
  • Select Board
  • Select Class

prove that sin x+sin3x+sin5x+sin7x=4cosx cos2x sin 4x

Asked by Gowtham(student), on 13/10/12

Answers

 sinx+sin3x+sin5x+sin7x

(sin 3x +  sin 5x)  +  (sin 7x  +  sin x )

2 sin 4x . cos x +  2 sin 4x . cos 3x

2 sin 4x (cos x+ cos 3x)

2 sin 4x (2 cos 2x . cos x)

2 cos 2x . cos x . sin 4x

Posted by pallintimanish....(student), on 14/10/12
Ask a QuestionHave a doubt? Ask our expert and get quick answers.
Show me more questions

 
Start Practising
Enter your board and class for better results:
    Start
    close