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
        
Prove tan(45+a)+tan(45-a)/tan(45+a)-tan(45-a)=cosec2a
2 years ago

Answers : (1)

Arun
24740 Points
							
tan(45+A)+tan(45-A) = 

= [tan(45)+tanA] / [1-tan45.tanA] + [tan(45)-tanA] / [1+tan45.tanA] = 

= (1+tanA) / (1-tanA) + (1-tanA) / (1 + tanA) = 

= (1+tanA)^2 / (1-tan^2A) + (1-tanA)^2 / (1 - tan^2A) = 

= [(1+tanA)^2 + (1-tanA)^2] / (1-tan^2A) = 2(1+tan^2A) / (1-tan^2A) = 

= 2sec2A
 
similarly
 
tan(45+A) – tan(45-A) = 2 tan2A
hence answer will be = 2 sec2A / 2 tan2A = 1/ sin 2A = cosec 2A
2 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