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
        
I didn't understand how to do this problem... How do you solve it?
6 months ago

Answers : (1)

Arun
20404 Points
							

Explanation:

sec(θ+α)+sec(θα)=2sec(θ) can be written as

1cos(θ+α)+1cos(θα)=2cosθ

or cos(θ+α)+cos(θα)cos(θ+α)cos(θα)=2cos(θ)

or2×2cosθcosαcos(θ+α+θα)+cos(θ+αθ+α)=2cosθ

or 2cosθcosαcos2θ+cos2α=1cosθ

or 2cos2θcosα=cos2θ+cos2α

or 2cos2θcosα=2cos2θ1+2cos2α1

or 2cos2θ(cosα1)=2cos2α2

or cos2θ=cos2α1cosα1=cosα+1

or cos2θ=2cos2(α2)

and cosθ=2cos(α2)

6 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

  • 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