Guest

if cosa=3/5 and cosb=5/13 then cos 2 (a-b/2)

if cosa=3/5 and cosb=5/13 then cos2(a-b/2)

Grade:9

2 Answers

Saurabh Koranglekar
askIITians Faculty 10336 Points
2 years ago
576-752_1569854293840289268227.jpg
sushmitha raj
42 Points
2 years ago
cos(a-b)=2cos2(a-b/2)-1
cos2(a-b/2)=cos(a-b)+1/2
cos(a-b)=cosa.cosb+sina.sinb
cos2(a-b/2)=1/2(15/65+48/5-1)
=-1/65
 
 

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free