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: 11
        Find out the value of cot6°× cot66°× cot42°× cot78° such as the given value is equal to 1.
3 years ago

Answers : (1)

Vikas TU
11138 Points
							
Here use the identities,
sinA*sin(A+60)*sin(60-A) = sin(3A)/4 and cosA*cos(A+60)*cos(60-A) = cos(3A)/4
Now divide the costerms eqn with sin terms to form the cot relation.
therefore, 
cotA*cot(A+60)*cot(60-A) = cot(3A)
Starting with A = 60 degree taking and by adjusting the cot and tan terms by multiplying and dividing U would get 1 as the final answer.
3 years 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

  • 31 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