MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 12
        
Let e1 and e2 be unit vectors in the OXY-plane which make angles α and β withthe x-axis. Show that e1 = i cos α + jsin α, e2 = i cos β + jsin β and prove thatcos(α − β) = cos α cos β + sin α sin β
4 months ago

Answers : (1)

Vikas TU
10040 Points
							
Dear student 
e1 and e2 are unit vector , angle in e1 = alpha . 
angle in e2 = beta 
e1 is unit vector so on drawing a traingle having alpha angle its x component = Cos\alpha i , and y component = Sin\alpha j 
Its magnitude = sqrt (Sin^2\alpha + Cos^2\alpha) = 1
Hence e1  = i cos α + jsin α
Similarly on drawing angle \beta angle in e2 . and applying same condition . 
e2 = i cos β + jsin β
Hope this helps 
Good Luck 
4 months ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 19 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details